The Round Valley War was an 1887 conflict between American colonists and Yuki Indians on the Round Valley Indian Tribes of the Round Valley Reservation in California. The Round Valley War was not an isolated incident but part of a broader pattern of settler colonialism and violence against Native populations in California. State-sponsored militias, land appropriation policies, and legal maneuvers collectively facilitated the dispossession and near-eradication of Indigenous peoples across the region.