The Bloody Island Massacre occurred in the context of indigenous enslavement and abuse in California. A number of Pomo people had been enslaved by two settlers, Andrew Kelsey and Charles Stone, and confined to one village where they were starved and abused until they rebelled and murdered their captors. This rebellion by the enslaved Pomo triggered a violent response from U.S. authorities.
In response to the murder of Kelsey and Stone, the U.S. Cavalry launched a military action against the Pomo on May 15, 1850, on what was then an island in Clear Lake called Bo-no-po-ti or Badon-napo-ti (Island Village) in the Pomo language, located at the north end of Clear Lake in Lake County, California. The engagement resulted in mass casualties among the Pomo population.
The Bloody Island Massacre represents a significant instance within the wider California genocide. A U.S. Cavalry operation killed at least 60 of the local Pomo. However, Major Edwin Allen Sherman's July 1850 report claimed substantially higher figures, contending that approximately 400 warriors were killed and drowned, with as many more women and children who drowned after plunging into the lake through fear, resulting in approximately 800 Native Americans found dead in Clear Lake. This massacre exemplified the violent suppression of indigenous resistance and the broader pattern of genocide against California's native populations during this period.
The Indian Wars encompass more than three centuries of armed conflict between the United States government, American settlers, and Indigenous nations — from the Powhatan Wars of the 1620s through the final Plains campaigns of the late 19th century. The eastern conflicts — King Philip's War (1675–1676), the Tuscarora War (1711–1715), and the Creek and Seminole Wars — largely ended organized Indigenous resistance east of the Mississippi by the 1840s. On the Great Plains, the Sioux Wars (1854–1890), Red River War (1874–1875), and Nez Perce War (1877) followed the displacement wrought by the transcontinental railroad and the near-extinction of the American bison — an estimated 30 to 60 million animals reduced to fewer than 1,000 by 1890. The Ghost Dance religious movement and the massacre at Wounded Knee (December 29, 1890), in which US cavalry killed approximately 250 Lakota men, women, and children, marked the effective end of armed resistance. The Dawes Act (1887) allotted reservation land to individual families, opening millions of acres to white settlement and reducing Indigenous landholdings by about two-thirds over the following decades.
At least 60 Pomo killed by U.S. Cavalry; Major Edwin Allen Sherman's July 1850 report claimed approximately 400 warriors and as many women and children drowned, totaling approximately 800 Native Americans dead in Clear Lake
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