The Battle of Walla Walla emerged from escalating tensions in the Yakima War following a Walla Walla raid on the Fort Walla Walla trading post and reports that Chief Peopeomoxmox had vowed to kill Washington Territory Governor Isaac Stevens. In response, troops from the Oregon Mounted Volunteers were dispatched to the Umatilla River and subsequently to the Touchet River to address the threat. Chief Peopeomoxmox and four others met the advancing troops at the Touchet and willingly became hostages to prevent an attack on his village, after which the volunteers and their five captives began marching toward the former Whitman Mission to establish a winter camp.
During the march, the soldiers discovered they were being pursued by a large group of Native warriors. A running battle commenced at the mouth of the Touchet River on December 7, 1855. On the first day of fighting, four of the five hostages, including Chief Peopeomoxmox, attempted to escape. The battle lasted from December 7 through December 11, 1855, making it the longest engagement of the Yakima War. The Walla Walla forces were joined by warriors from several allied tribes, including the Cayuse, Palouse, and Yakama, demonstrating the broad coalition arrayed against the Oregon Mounted Volunteers.
This prolonged engagement represented a significant military action within the broader Yakima War conflict and highlighted the determination of the allied Native American forces to resist the volunteer forces. The battle's duration and the participation of multiple tribal nations underscored the scale of resistance mounted by Indigenous peoples in the region during this period of conflict.
The early republic period saw the United States move from the weak Articles of Confederation to the federal Constitution ratified in 1788, with the Bill of Rights added in 1791. George Washington served two terms as president (1789–1797), establishing precedents for executive authority, and the federal capital moved permanently to Washington D.C. in 1800. The Louisiana Purchase (1803) doubled the nation's territory for roughly $15 million, opening vast trans-Mississippi lands to American expansion. The War of 1812 against Britain ended inconclusively but produced a surge of American national identity and eliminated most British support for Indigenous resistance east of the Mississippi. The Northwest Indian Wars (1785–1795) and the Creek War (1813–1814) broke Indigenous confederacies that had resisted US expansion. The Missouri Compromise of 1820 temporarily balanced slave and free states as the nation expanded westward, but embedded the contradiction of slavery in every subsequent territorial debate.
Several Cayuse killed; light US losses
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