The Coeur d'Alene War of 1858 represented the second phase of the Yakima War, emerging from escalating tensions between allied Native American tribes and the expanding United States military presence in the Pacific Northwest. The conflict involved the Skitswish, Kalispell, Spokane, Palouse, and Northern Paiute tribes acting in coordinated resistance against U.S. Army forces across Washington and Idaho territories.
The engagement at Spokane Plains occurred on September 5, 1858, four days after Colonel George Wright's forces defeated the allied tribes at the Battle of Four Lakes on September 1st. Wright commanded a force of 601 men against the combined Indian forces, which had been reinforced by Kalispell warriors by the time of the Spokane Plains battle. The campaign represented a major military response to the earlier May 1858 Battle of Pine Creek, where approximately 1,000 Skitswish, Spokane, and Palouse warriors had attacked and defeated Colonel Edward Steptoe's force of 164 American troops.
The outcome of the Spokane Plains battle and the broader campaign had significant historical consequences for the region. Following the Four Lakes victory, the U.S. Army executed seventeen Palouse warriors along Latah Creek, which subsequently became known as Hangman Creek—a name that persisted in Idaho though Washington reverted the name back to Latah Creek. Among those hanged was Qualchan, a Yakima chief. These military defeats and subsequent executions effectively ended organized tribal resistance in the region and consolidated U.S. control over Washington and Idaho territories.
The Mexican-American War (1846–1848) grew from the annexation of Texas (1845) and a disputed border between Texas and Mexico at the Rio Grande. President James K. Polk ordered US troops under General Zachary Taylor into the contested zone; after a skirmish that killed American soldiers, Congress declared war in May 1846. US forces won a series of engagements — Palo Alto, Monterrey, Buena Vista — before General Winfield Scott led an amphibious landing at Veracruz and an overland campaign to Mexico City, which fell in September 1847. The Treaty of Guadalupe Hidalgo (February 1848) transferred California, Nevada, Utah, most of Arizona and New Mexico, and parts of Colorado and Wyoming to the United States in exchange for $15 million and assumption of $3.25 million in claims — roughly 525,000 square miles, a 67 percent expansion of US territory. The war's outcome immediately reopened the slavery question: the Wilmot Proviso, debated throughout the war, proposed banning slavery from any territory acquired from Mexico, foreshadowing the sectional crisis of the 1850s.
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