<Table> <Tr> <Th_colspan="2"> Pig War </Th> </Tr> <Tr> <Td_colspan="2"> 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 . </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> Date </Th> <Td> June 15--October 1859 (troops stationed on San Juan Island until 1874) </Td> </Tr> <Tr> <Th> Location </Th> <Td> San Juan Islands </Td> </Tr> <Tr> <Th> Result </Th> <Td> Bloodless war--San Juan Islands awarded to the United States following third - party arbitration . </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th_colspan="2"> Belligerents </Th> </Tr> <Tr> <Td> United States, Washington Territory </Td> <Td> United Kingdom, Colony of Vancouver Island </Td> </Tr> <Tr> <Th_colspan="2"> Commanders and leaders </Th> </Tr> <Tr> <Td> Colonel Silas Casey, Captain George Pickett </Td> <Td> Rear Admiral R.L. Baynes </Td> </Tr> <Tr> <Th_colspan="2"> Strength </Th> </Tr> <Tr> <Td> 461 combatants, 14 cannon </Td> <Td> 2,140 combatants; 5 warships mounting 70 cannon </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Pig War </Th> </Tr>

When did the us go to war over a pig