How a single pig nearly triggered a war between two global superpowers in 1859
In 1859, a dispute over a pig rooting in a garden on San Juan Island escalated into a tense military standoff between the United States and Britain. While no humans were killed, the incident nearly ignited a full-scale war, revealing deep-seated tensions over a poorly defined international border.
The conflict originated from the 1846 Oregon Treaty, which aimed to divide territory between the U.S. and Britain. The treaty mandated a border running through the middle of the channel separating the continent from Vancouver Island. However, geographical ambiguity made it unclear whether the boundary followed the Haro Strait or the Rosario Strait. Both nations claimed sovereignty over the San Juan Islands, a strategic location for controlling regional shipping lanes.
Tensions boiled over on June 15, 1859, when American farmer Lyman Cutlar shot a pig belonging to a Hudson’s Bay Company employee. When British authorities threatened arrest, American settlers requested military protection. Brigadier General William S. Harney dispatched Captain George Pickett and 66 soldiers to the island. Britain responded by sending warships, leading to a standoff where hundreds of troops and dozens of cannons faced off across the island. Rear Admiral Robert L. Baynes eventually refused to escalate the situation, famously declaring he would not start a war over a squabble about a pig.
To prevent further conflict, President James Buchanan sent General Winfield Scott to negotiate. Both nations agreed to a joint military occupation, which lasted 12 years. During this time, soldiers from both sides maintained an amicable social life, despite the underlying geopolitical friction. The dispute was finally resolved in 1872 through international arbitration by German Emperor Wilhelm I, who ruled in favor of the American-preferred Haro Strait boundary. The British withdrew in 1872, followed by the Americans in 1874, ending the long-standing standoff.
Source: Pig War (1859)
