Slaughter Slough is a wetland in southwestern Minnesota, named for being the site of the Lake Shetek Massacre during the Dakota War of 1862. It is located in Murray County east of Lake Shetek. On August 20, 1862, about 25-30 Sisseton warriors and women led by Chief Lean Bear of the Sleepy-Eye band attacked the Euro-American settlers living nearby, killing 15 and taking 3 women and 8 children captive. 21 settlers escaped and made difficult treks across the prairie to safety.