The Bloody Island Massacre occurred in the context of indigenous enslavement and abuse by American settlers. 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 act of resistance by the enslaved Pomo prompted a swift and violent response from U.S. authorities.
In response to the deaths of Kelsey and Stone, the U.S. Cavalry launched a military operation against the Pomo at Clear Lake on May 15, 1850. The massacre took place on what was then an island in Clear Lake called Bo-no-po-ti or Badon-napo-ti (Island Village) in Pomo language, located at the north end of Clear Lake in Lake County, California. The cavalry killed at least 60 of the local Pomo during this engagement.
The Bloody Island Massacre stands as part of the wider California genocide. A July 1850 report by Major Edwin Allen Sherman claimed far higher casualties, contending that there were not less than four hundred warriors killed and drowned at Clear Lake, with as many more women and children who plunged into the lake and drowned through fear, suggesting approximately eight hundred Native Americans died in total. The massacre exemplified the violent suppression of indigenous resistance and the dispossession of Native peoples during the period of American expansion in California.
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 according to the article; Major Edwin Allen Sherman's July 1850 report claimed approximately 800 Native Americans (warriors, women, and children) killed and drowned at Clear Lake
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