The Bear River Massacre: A detachment of California Volunteers led by Colonel Patrick Edward Connor engage the Shoshone at Bear River, Washington Territory, killing hundreds of men, women and children.

The Bear River Massacre was a United States military attack that killed an estimated 250 to 493 children, women, and men at a Shoshone winter encampment on January 29, 1863. Some sources describe it as the largest mass murder of Native Americans by the US military and the largest single episode of genocide in US history. It took place in present-day Franklin County, Idaho near the present-day city of Preston on January 29, 1863. After years of skirmishes and food raids on farms and ranches, and settlers displacing Shoshone from their ancestral lands, the United States Army attacked a large Shoshone community at the confluence of the Bear River and Battle Creek in what was then southeastern Washington Territory.