Pig War

Proposed boundaries:
  Through Haro Strait, favored by the US
  Through Rosario Strait, favored by Britain
  Through San Juan Channel, compromise proposal
The lines are as shown on maps of the time. The modern boundary follows straight line segments and roughly follows the blue line. The modern eastern boundary of San Juan County roughly follows the red line.
DateJune 15 – October 1859 (troops stationed on San Juan Island until 1874)
Location
Result Bloodless war – San Juan Islands awarded to the United States following third-party arbitration.
Belligerents

 United States

 United Kingdom

Commanders and leaders
Colonel Silas Casey, Captain George Pickett Rear Admiral R. L. Baynes
Strength
461 combatants, 14 cannons 2,140 combatants; 5 warships mounting 70 cannons