In the summer of 1859, a quiet island in the Pacific Northwest became the centre of one of the strangest international crises in modern history. Two powerful nations—the United States and Great Britain—found themselves on the brink of war. Warships gathered offshore. Soldiers dug defensive positions. Local officials issued threats and demands. Diplomats exchanged urgent messages.
And the entire crisis had begun with the shooting of a pig.
At first glance, the story sounds like historical comedy. One American farmer, frustrated that a neighbor’s pig kept eating his potatoes, shot the animal. The pig belonged to a British employee of the Hudson’s Bay Company. What followed was a dispute over compensation that spiraled rapidly into a confrontation between American settlers, British colonial authorities, and eventually the armed forces of two global powers.
But the Pig War was never really about a pig.
Beneath the absurd surface lay a much deeper problem. For decades, Britain and the United States had struggled to define their western border in North America. Vague treaties, incomplete maps, competing imperial ambitions, and the relentless movement of American settlers into western territories created a situation where even a small local dispute could ignite a much larger conflict. By the 1850s, the San Juan Islands—located between Vancouver Island and the American mainland—had become a particularly dangerous flashpoint.
When the pig was shot on San Juan Island, the question was no longer about livestock or potato gardens. It became a test of sovereignty. Were the islands American territory or British territory? Who had the authority to enforce the law? And who would back down first?
Within weeks, American troops occupied the island while British warships surrounded it with powerful naval guns. One wrong decision, one nervous soldier, or one ambitious officer could have triggered a war between two nations that had already fought each other multiple times in the previous century.
The Pig War stands today as a remarkable example of how international crises can begin with the smallest incidents. It also demonstrates something equally important: how restraint, diplomacy, and level-headed leadership can prevent a ridiculous situation from turning into a catastrophic one.
Before the pig was shot, however, the roots of the conflict had already been growing for decades. To understand how a farmyard dispute nearly started a war, we first have to look at the border problem Britain and the United States had never properly solved.
The Border Problem Britain and America Never Properly Solved
The roots of the Pig War stretch back to the very birth of the United States. When the American Revolutionary War ended in 1783, Britain and the newly independent United States met in Paris to negotiate the Treaty of Paris, which formally recognized American independence and established the first official border between the two countries.
At the time, much of North America was still poorly mapped and only partially understood by European powers. Diplomats negotiating the treaty relied on incomplete geographic information and sometimes on maps that were simply wrong. Rivers were misplaced, lakes were drawn inaccurately, and entire regions remained largely unexplored by Europeans. Nevertheless, the negotiators needed to define a boundary, and so they relied on the geographic knowledge available to them—flawed though it was.
The treaty attempted to define the border using natural landmarks such as rivers, lakes, and highlands. In theory, this seemed straightforward. In practice, the descriptions often referred to geographic features that did not exist exactly as the treaty described them. Some rivers flowed in different directions than expected, some lakes had different shapes, and certain landmarks were located in entirely different places.
These inaccuracies created confusion almost immediately.
As settlers, traders, and explorers pushed westward across the continent, the limitations of the original treaty became increasingly obvious. Disputed interpretations of the border appeared in several regions, forcing Britain and the United States to revisit the issue repeatedly throughout the early nineteenth century. Tensions between the two countries remained high during this period, particularly after the War of 1812, which had demonstrated that the two nations were still capable of going to war over territorial disagreements.
After that conflict ended, both sides recognized that many sections of their shared border needed clarification. Diplomatic negotiations continued for decades, gradually redefining and correcting the boundary as new geographic knowledge became available. One important step came in the Convention of 1818, which attempted to simplify part of the border by extending the boundary westward along the 49th parallel.
This decision solved several problems—but it also created new ones.
The agreement worked reasonably well across much of the continent, but it stopped at the Rocky Mountains. Beyond those mountains lay a vast region known as Oregon Country, an enormous and sparsely populated territory stretching to the Pacific Ocean. Both Britain and the United States claimed this land, and neither was willing to give it up.
Rather than risk another war, the two countries reached a temporary compromise. They agreed to jointly occupy the territory. Citizens of both nations could settle, trade, and operate there while the question of sovereignty remained unresolved.
At the time, this arrangement seemed practical. In reality, it only postponed a much larger problem.
Oregon Country, Manifest Destiny, and Competing Imperial Visions
During the first half of the nineteenth century, the vast territory west of the Rocky Mountains—known as Oregon Country—became one of the most contested regions in North America. Stretching from present-day Oregon and Washington north into modern British Columbia, the area was rich in natural resources, fertile land, and strategic waterways. Both the United States and Great Britain believed they had legitimate claims to it.
For the United States, the region represented the next step in the nation’s westward expansion. By the 1840s, a powerful ideological belief had taken hold among many Americans: the idea that the United States was destined to expand across the entire continent. This belief, later called Manifest Destiny, framed expansion not merely as opportunity but as a national mission. Supporters argued that American institutions, settlers, and economic systems should spread from the Atlantic Ocean to the Pacific.
Encouraged by this mindset, thousands of American settlers began traveling west along the Oregon Trail. These migrants were farmers, families, and fortune seekers hoping to claim land and build new communities in the Pacific Northwest. As their numbers grew, American influence in the region increased dramatically. Settlements appeared along river valleys and fertile plains, and the presence of these settlers strengthened the United States’ political claim to the territory.
The British vision for the region was very different.
British influence in Oregon Country came primarily through the Hudson’s Bay Company, a powerful chartered trading company that dominated the North American fur trade. For decades, the company had operated a vast network of trading posts throughout the Pacific Northwest, exchanging goods with Indigenous communities and shipping valuable furs—especially beaver pelts—back to Europe.
To the Hudson’s Bay Company, Oregon Country was less a destination for settlers and more a commercial frontier. The company’s goal was to control trade routes, manage fur resources, and maintain strategic access to rivers such as the Columbia. British administrators feared that large-scale American settlement would disrupt the fur trade, drive away wildlife, and undermine the company’s economic model.
These competing visions created a fundamental conflict. American settlers wanted land for farming and permanent communities, while the British commercial system depended on keeping large areas sparsely populated to preserve the fur trade. As more American migrants poured into the region, the delicate balance created by the joint occupation agreement began to collapse.
By the mid-1840s, the dispute had grown increasingly dangerous. American politicians demanded control of the entire Oregon territory, with some even advocating the slogan “Fifty-Four Forty or Fight,” referring to the northern latitude they believed should mark the border with British North America. Britain, meanwhile, was determined to protect its commercial interests and colonial influence in the region.
War seemed possible.
Yet neither country truly wanted another costly conflict. Instead, diplomats once again turned to negotiation. In 1846, Britain and the United States reached a compromise that would redraw the border in the Pacific Northwest.
The solution seemed simple on paper—but it would soon create one of the most absurd territorial disputes in history.
The 1846 Treaty and the Dangerous Ambiguity of the Channel Boundary
In 1846, Britain and the United States finally reached an agreement intended to settle the Oregon boundary dispute once and for all. The Oregon Treaty extended the existing border westward along the 49th parallel—the same latitude already used to separate the two nations across much of the continent.
On a map, the solution appeared neat and logical. The border would run in a straight line along the 49th parallel until it reached the Pacific Northwest. From there, the treaty specified that the boundary would pass through the “middle of the channel” separating Vancouver Island from the mainland before continuing south to the Pacific Ocean.
The compromise satisfied both governments. The United States gained control of the territory that would eventually become Washington, Oregon, and other western states, while Britain retained Vancouver Island and its important colonial base at Victoria. Both sides believed they had avoided a dangerous war through reasonable diplomacy.
The problem was that the treaty’s wording contained a critical flaw.
The negotiators had assumed there was a single, clearly defined channel separating Vancouver Island from the mainland. In reality, the waters between the island and the continent formed a complex maze of straits, passages, and smaller waterways. Among these channels were two major routes: the Rosario Strait, located closer to the American mainland, and the Haro Strait, located closer to Vancouver Island.
Between these two waterways lay a cluster of islands known as the San Juan Islands.
If the treaty’s boundary ran through the Rosario Strait, the islands would fall under British control. If it ran through the Haro Strait, they would belong to the United States.
The treaty did not clarify which channel it meant.
At first, the ambiguity attracted little attention. The San Juan Islands were remote, sparsely populated, and far from the centers of political power in London and Washington. For a time, neither government saw the issue as urgent enough to resolve.
But as settlement increased in the Pacific Northwest, the islands began to gain strategic and economic importance. Their location allowed control of key shipping routes, and their land offered excellent farming opportunities. Before long, both Americans and British authorities began acting as though the islands belonged to them.
Each side pointed to the treaty and insisted that its interpretation was the correct one.
With both governments convinced they held legal sovereignty—and with settlers arriving who expected protection from their respective nations—the San Juan Islands quietly transformed from a cartographic misunderstanding into a potential international crisis.
It was only a matter of time before someone on the ground forced the issue.
James Douglas, the Hudson’s Bay Company, and the British Push to Secure San Juan
Among the most determined defenders of British interests in the Pacific Northwest was James Douglas, a powerful and influential colonial administrator. Douglas had spent much of his career working for the Hudson’s Bay Company and had risen to become one of the most important figures in British North America. Eventually serving as governor of Vancouver Island, he was deeply invested in maintaining British authority in the region.
Douglas viewed American expansion with suspicion and frustration. Over the years, he had watched waves of American settlers pour into Oregon Country, gradually shifting the balance of power in the territory. The compromise of the Oregon Treaty in 1846 had already forced Britain to accept a border that many British officials considered a concession to American pressure.
To Douglas, the San Juan Islands represented one of the last remaining opportunities to maintain British influence south of Vancouver Island.
He believed firmly that the treaty’s boundary should follow the Rosario Strait, which would place the islands within British territory. But Douglas also understood an important reality of frontier politics: possession often mattered more than theory. If British settlers and businesses established a permanent presence on the islands, it would strengthen Britain’s claim when the dispute was eventually resolved.
Acting on this logic, Douglas took steps to ensure that the islands would not remain empty.
In 1853, he arranged for the Hudson’s Bay Company to establish a sheep farm on San Juan Island, the largest of the disputed islands. The operation was placed under the management of Charles Griffin, an employee of the company. Griffin arrived on the island with a group of shepherds—many of them Hawaiian workers employed by the company—and began building a large agricultural operation.
The farm quickly expanded. Hundreds of sheep grazed across the island’s open pastures, and the Hudson’s Bay Company soon controlled one of the most significant agricultural enterprises in the region. The presence of the farm was intended to demonstrate that the island was being actively used and administered by British interests.
From Douglas’s perspective, the strategy was both practical and political. If Britain could show that its subjects lived and worked on the island, the argument that the territory belonged to Britain would appear stronger.
However, Douglas had underestimated how quickly American settlers would begin to arrive.
By the mid-1850s, migrants traveling through the Pacific Northwest had started to notice the fertile land and mild climate of the San Juan Islands. Many of these settlers believed that the islands were part of American territory, based on their interpretation of the Oregon Treaty.
Soon, American homesteaders began establishing farms on San Juan Island as well.
With British company workers and American settlers living side by side—each convinced they were on their own nation’s land—the island became a place where everyday disagreements could easily take on international significance. Land claims overlapped. Authorities from both sides attempted to enforce their own laws. Tax collectors, local officials, and settlers all acted as though sovereignty had already been decided.
The situation grew tense long before the famous pig was ever involved.
San Juan Island had quietly become a frontier where two competing empires existed in the same space—and sooner or later, something was bound to go wrong.
Sheep, Settlers, and a Growing Clash on San Juan Island
By the late 1850s, San Juan Island had become an uneasy frontier where British and American interests overlapped in increasingly uncomfortable ways. The Hudson’s Bay Company maintained its large sheep farm under Charles Griffin, while American settlers gradually moved onto the island and began claiming land for themselves. Each group believed it was operating within its own nation’s rightful territory.
The result was a confusing and volatile situation.
American settlers typically acted under the authority of nearby Washington Territory, assuming that U.S. laws applied to the island. British authorities, however, believed the San Juan Islands were part of British territory administered from Vancouver Island. Officials on both sides therefore attempted to enforce their own rules, collect taxes, and regulate settlement.
These overlapping claims produced a series of confrontations.
American officials from Whatcom County attempted to collect taxes from the Hudson’s Bay Company’s operations on the island, arguing that the British farm was operating within American jurisdiction. Griffin and the company refused to pay, insisting that the island belonged to Britain and that American authorities had no legal authority there.
The dispute escalated quickly. When American officials threatened to seize property to recover the unpaid taxes, the Hudson’s Bay Company protested vigorously to British colonial authorities. Meanwhile, American settlers accused the British company of attempting to dominate the island’s land and prevent American expansion.
In one particularly chaotic episode, American officials attempted to confiscate several of the Hudson’s Bay Company’s valuable breeding rams as payment for the disputed taxes. The sheep were seized and loaded onto boats while Griffin protested helplessly. When he tried to intervene, the Americans reportedly drew their weapons, forcing him to back down.
The incident outraged British authorities.
From their perspective, American officials had illegally seized property belonging to British subjects on British territory. Complaints were sent to higher authorities, and both governments eventually instructed their local officials to avoid further escalation. Neither London nor Washington wanted to start a diplomatic crisis over livestock and tax disputes on a remote island.
Yet the underlying problem remained unresolved.
American settlers continued to arrive, convinced they had the right to claim land on the island. British company employees continued to operate their farm under the assumption that the territory belonged to Britain. The island effectively existed in a legal gray zone where two governments claimed authority but neither had clear control.
Under such conditions, even small conflicts carried the potential to spiral out of control.
And in 1859, one of those small conflicts arrived in the form of a wandering pig.
Lyman Cutler, the Potato Patch, and the Shooting of the Pig
In 1859, one of the American settlers living on San Juan Island was a young farmer named Lyman Cutler. Like many of the Americans who had moved to the island, Cutler believed he was settling on legitimate American territory. He had established a small homestead and planted crops, including a patch of potatoes that he hoped would support his new life on the frontier.
Unfortunately for Cutler, his property lay close to the grazing lands used by the Hudson’s Bay Company’s farm.
Among the animals roaming the company’s fields was a large Berkshire pig owned by Charles Griffin. The pig had a habit of wandering freely across the island in search of food. More than once, it found its way into Cutler’s garden and began digging up the carefully planted potato crop.
Each time this happened, Cutler drove the pig away. The damage to his crops irritated him, and he eventually confronted Griffin about the problem. According to later accounts, Cutler demanded that Griffin keep the animal under control. Griffin reportedly responded that it was Cutler’s responsibility to fence his garden properly if he wanted to protect his crops.
The disagreement simmered for some time.
Then, on a summer day in June 1859, the pig wandered into Cutler’s potato patch once again.
Frustrated after repeated incidents, Cutler grabbed his rifle and shot the animal. The pig died in the garden it had been rooting through.
Almost immediately, Cutler realized that the situation might become complicated. The pig belonged to Griffin, and the Hudson’s Bay Company took its livestock seriously. Hoping to avoid a larger dispute, Cutler went to Griffin and admitted what he had done.
He offered to compensate Griffin for the loss of the animal.
The conversation quickly went badly.
Griffin demanded $100 for the pig, an enormous amount of money at the time. Cutler refused, arguing that the animal had repeatedly trespassed onto his property and destroyed his crops. In his view, the price was outrageous. In Griffin’s view, the killing of the pig had been unjustified.
The disagreement might have ended as an ordinary frontier quarrel, but the larger political situation on the island made it far more dangerous.
Griffin reported the incident to British authorities, who began considering legal action against Cutler. If San Juan Island was British territory, then Cutler—an American citizen—had killed property belonging to a British subject and could be arrested and tried under British law.
To American settlers on the island, this possibility was alarming.
The idea that British officials might arrest an American farmer on what they believed was American soil was seen as a serious violation of their rights. What had begun as a dispute over a pig and a potato patch now threatened to become a confrontation over sovereignty.
In a region already tense with competing claims, the death of a single farm animal had suddenly created a diplomatic crisis.
General Harney and the Deliberate Escalation of a Local Dispute
After the pig shooting, tensions on San Juan Island rose quickly. American settlers feared that British authorities might arrest Lyman Cutler and try him under British law. To them, such an action would be unacceptable if the island truly belonged to the United States. Word of the incident soon reached American military officials responsible for the Pacific Northwest.
One of those officials was General William S. Harney, commander of the U.S. Army’s Department of Oregon.
Harney was a controversial figure with a long reputation for aggression and insubordination. Throughout his career he had clashed with superiors, ignored orders, and involved himself in reckless actions. Some contemporaries considered him brave and decisive, while others described him as impulsive and dangerously unpredictable. What almost everyone agreed on was that Harney disliked the British and rarely hesitated to escalate a confrontation.
When Harney learned that British authorities might attempt to arrest an American settler on San Juan Island, he reacted immediately.
Instead of pursuing diplomatic clarification, Harney chose a dramatic military response. In July 1859 he ordered Captain George Pickett—a young U.S. Army officer who would later become famous during the American Civil War—to take a detachment of American soldiers to San Juan Island and occupy it.
Pickett landed on the island with several dozen troops and established a camp overlooking the shoreline. The soldiers raised the American flag and announced that the island was under the protection of the United States Army. Their orders were clear: prevent any attempt by British authorities to arrest American settlers or assert control over the island.
From the British perspective, the move looked like an invasion.
San Juan Island was still disputed territory. By placing American troops there without any diplomatic agreement, Harney had transformed a local property dispute into a direct military challenge. British officials now faced a difficult choice. If they ignored the American presence, it might appear as though they had conceded the island to the United States. But if they responded with force, the situation could quickly escalate into war.
Harney seemed fully aware of the risk.
Communication between Washington, D.C., and the Pacific Northwest took weeks. By the time the American government learned what had happened, events on the ground might already be irreversible. If the United States established a military presence on the island quickly enough, Harney may have believed that Britain would ultimately accept the situation rather than fight over it.
Whatever his motives, the decision placed both nations in an extremely dangerous position.
A remote island that had previously hosted sheep farmers and a handful of settlers was now occupied by armed soldiers representing two rival empires. The next move belonged to the British authorities.
The Military Standoff That Nearly Turned Into War
The arrival of American troops on San Juan Island immediately alarmed British authorities. From their perspective, Captain George Pickett’s landing was not a defensive measure but a direct military occupation of territory that Britain believed belonged to it. News of the American presence quickly reached James Douglas, the governor of Vancouver Island and one of the most determined defenders of British authority in the region.
Douglas was furious.
To him, the appearance of American soldiers on the island confirmed his worst fears about American expansion. For years he had watched American settlers push steadily northward and westward, gradually eroding British influence in the Pacific Northwest. Now, with American troops openly stationed on San Juan Island, he believed the United States was attempting to seize the territory by force.
Douglas turned to the most powerful tool available to him: the Royal Navy.
British naval vessels soon sailed into the waters surrounding San Juan Island. These ships carried heavy guns capable of destroying Pickett’s small camp in a matter of minutes. From the decks of their warships, British officers observed the American soldiers digging defensive positions and raising their flag on the disputed land.
The situation grew tense very quickly.
The British demanded that the American troops leave the island. Pickett refused. He insisted that his men were protecting American settlers and that the island belonged to the United States. If British troops attempted to land, he warned, his soldiers would resist.
Meanwhile, reinforcements arrived on both sides.
Additional American troops were sent to strengthen Pickett’s position, while more British naval ships gathered in the surrounding waters. At one point, several powerful British warships faced a small but determined American garrison on shore. If the British had opened fire, the American position would likely have been overwhelmed within minutes.
But such an attack would almost certainly have triggered a full-scale war between Britain and the United States.
Both sides understood the stakes. The British officers commanding the naval forces knew that a single cannon shot could ignite a conflict between two major powers. The American soldiers on the island realized that they were dangerously exposed and that their position could be destroyed if the British decided to act.
The standoff continued for days.
Despite the growing tension, neither side fired the first shot. British naval commanders hesitated to escalate the situation without clear orders from higher authorities, and American officers knew that any aggressive action might provoke a devastating response.
For a brief moment in the summer of 1859, the fate of peace between Britain and the United States rested largely on the judgment of a few military officers stationed on a small island in the Pacific Northwest.
One rash decision could have changed the course of North American history.
The Cooler Heads Who Prevented Disaster
Although the confrontation on San Juan Island had the potential to spiral into war, several key figures on both sides chose restraint over escalation. Their decisions ultimately prevented the situation from turning into a disastrous conflict.
One of the most important acts of restraint came from the Royal Navy officers commanding the British ships surrounding the island. While Governor James Douglas had initially pushed for a firm response to the American occupation, the naval commanders recognized the enormous consequences of initiating hostilities. Opening fire on American troops would almost certainly trigger a war between Britain and the United States.
The senior naval officer in the region, Rear Admiral Robert L. Baynes, played a crucial role in calming the situation. Baynes reportedly dismissed the idea of attacking the American camp outright, recognizing how absurd it would be for two major powers to go to war over such a small and ambiguous dispute. Rather than escalate the confrontation, he ordered British forces to maintain their position without provoking the Americans.
This decision effectively removed the immediate threat of battle.
On the American side, the federal government soon realized that General Harney’s actions had created a dangerous crisis. President James Buchanan, already struggling with mounting political tensions that would soon erupt into the American Civil War, had no desire to start another international conflict with Britain.
To resolve the situation, Buchanan turned to one of the most experienced officers in the U.S. Army: General Winfield Scott.
Scott was widely respected for his military leadership and diplomatic skill. Despite being elderly and suffering from severe health problems, he traveled across the continent to personally manage the crisis in the Pacific Northwest. His goal was simple—prevent the situation from escalating while both governments worked toward a diplomatic solution.
When Scott arrived, he quickly assessed the situation and recognized how precarious it had become. American troops were entrenched on the island, British naval forces controlled the surrounding waters, and both sides believed they had legitimate claims to the territory.
Scott negotiated directly with British officials and proposed a temporary compromise.
Under this arrangement, both Britain and the United States would maintain a small military presence on San Juan Island while the sovereignty dispute remained unresolved. Each nation would station a limited number of troops on separate parts of the island, avoiding any actions that might provoke conflict. The two governments would then work toward a long-term diplomatic settlement.
Both sides agreed.
The agreement created what became known as a joint military occupation of the island. American and British troops remained stationed there, but strict limits were placed on their numbers and activities. The immediate danger of war had passed.
What had nearly become a military catastrophe was instead transformed into a fragile but workable peace—thanks largely to the restraint of naval officers and the diplomatic efforts of Winfield Scott.
Joint Occupation, Civil War, and the Long Delay in Final Settlement
Under the agreement negotiated by General Winfield Scott, San Juan Island entered an unusual period in its history. Rather than belonging definitively to either country, it would be jointly occupied by both Britain and the United States while diplomats worked toward a permanent solution.
Each nation maintained a small military camp on the island.
The American troops established their base on the southern end of San Juan Island, while the British Royal Marines created a camp on the northern side. The arrangement was carefully designed to prevent unnecessary confrontation. Both sides kept their forces limited in size, avoided provocative actions, and allowed the dispute to remain unresolved while political leaders considered a final settlement.
Surprisingly, the joint occupation turned out to be remarkably peaceful.
Despite the tensions that had nearly led to war, the soldiers stationed on the island generally got along well. Life on a remote frontier outpost often involved long periods of boredom, and the troops from both nations gradually developed a friendly relationship. They visited one another’s camps, attended celebrations together, and occasionally competed in games and social gatherings.
The Americans joined British celebrations of Queen Victoria’s birthday, while British troops attended American festivities for the Fourth of July. In many ways, the soldiers demonstrated a level of cooperation that had been absent during the political crisis that brought them there.
Meanwhile, the larger political situation in North America was becoming far more serious.
In the United States, tensions between northern and southern states were rapidly escalating toward what would become the American Civil War. By the time the war broke out in 1861, the San Juan dispute had become a relatively minor issue compared to the existential crisis facing the American government.
With the nation consumed by civil war, the United States had little interest in pursuing a confrontation with Britain over a group of remote islands. At the same time, Britain also preferred stability in the region and had no desire to provoke conflict with the United States while it struggled with internal turmoil.
As a result, the joint occupation continued for years.
British and American troops remained on the island, quietly maintaining their separate camps while diplomats postponed the difficult question of sovereignty. Although tensions occasionally resurfaced in diplomatic discussions, neither side pushed aggressively for a final decision.
What had once been a near-war gradually faded into a long-standing but peaceful stalemate.
Yet the fundamental question remained unanswered: Who actually owned the San Juan Islands?
International Arbitration and the Final Award of the San Juan Islands
After more than a decade of uncertainty, Britain and the United States finally agreed that the San Juan dispute needed a definitive resolution. The joint occupation had prevented war, but it was never meant to be permanent. Both governments recognized that the question of sovereignty over the islands still had to be settled.
In 1871, the two nations reached a broader diplomatic agreement known as the Treaty of Washington. Among several issues addressed in the treaty—including disputes stemming from the American Civil War—was the long-standing question of the San Juan Islands. Rather than continuing negotiations that had already stalled for years, Britain and the United States agreed to submit the matter to international arbitration.
The arbitrator chosen for the case was Kaiser Wilhelm I of Germany.
Representatives from both countries presented their arguments regarding the interpretation of the Oregon Treaty of 1846. The central issue remained the same one that had caused the original confusion: which channel had the treaty intended as the international boundary?
The British argument focused on the Rosario Strait, the channel located closer to the American mainland. If the border followed this route, the San Juan Islands would fall under British control.
The American argument favored the Haro Strait, the channel located to the west of the islands. Under this interpretation, the San Juan Islands would lie on the American side of the boundary.
After reviewing the evidence and arguments, Kaiser Wilhelm’s arbitration commission delivered its decision in 1872.
The ruling favored the American interpretation.
The commission determined that the treaty’s boundary should follow the Haro Strait, placing the San Juan Islands within the territory of the United States. Britain accepted the decision and agreed to withdraw its forces from the island.
On November 25, 1872, the final British troops departed San Juan Island, ending the joint military occupation that had lasted for thirteen years. American forces remained, and the islands formally became part of the United States.
With that, the long-running dispute that had nearly triggered a war between two major powers finally came to a peaceful conclusion.
Remarkably, throughout the entire crisis—from the shooting of the pig to the final arbitration—only a single casualty had ever occurred: the pig itself.
Why the Pig War Still Matters
At first glance, the Pig War seems like little more than an amusing historical curiosity. The idea that two powerful nations nearly went to war over a pig wandering through a potato patch sounds almost too absurd to be true. Yet the story has endured precisely because it reveals something deeper about how international conflicts can develop.
The pig was never the real cause of the crisis.
Long before Lyman Cutler fired his rifle, the conditions for conflict already existed. Britain and the United States had created a vague and poorly defined border through the Oregon Treaty of 1846. Both nations believed they had legitimate claims to the San Juan Islands. American settlers were pushing steadily westward under the banner of Manifest Destiny, while British officials sought to defend their remaining influence in the Pacific Northwest. Local authorities, military officers, and settlers all acted according to their own interpretations of sovereignty.
The shooting of the pig simply forced the issue into the open.
What makes the Pig War remarkable is not just how easily the situation could have escalated, but how it ultimately did not. In an era when wars were often triggered by pride, misunderstanding, or territorial ambition, the leaders involved eventually chose caution and diplomacy. British naval officers refused to fire on American troops, and General Winfield Scott negotiated a compromise that allowed both sides to step back from the brink.
The long joint occupation that followed demonstrated that peaceful coexistence was possible even in the middle of an unresolved territorial dispute. Instead of allowing the situation to deteriorate, both governments accepted a temporary arrangement and later agreed to submit the matter to international arbitration.
In the end, the Pig War became a rare example of a conflict that almost happened—but did not.
Today, it stands as a reminder that many historical crises begin not with grand strategies or deliberate acts of aggression, but with small misunderstandings layered on top of deeper political tensions. A poorly written treaty, a disputed border, an ambitious officer, and a frustrated farmer were enough to bring two nations to the edge of war.
Fortunately, the story also shows that restraint can be just as powerful as force.
Thanks to diplomacy, patience, and a few level-headed decisions, the Pig War concluded without bloodshed. The only casualty was a wandering Berkshire pig—an unlikely figure whose death briefly threatened to alter the course of North American history.