Big Foot, Indian name Si Thanka. Chief of the Minneconjou (Sioux); c. 1825 -29.12.1890 Wounded Knee. Wounded Knee Massacre; massacre by US. soldiers on c. 200 Sioux Indians who had left their reservation under the leadership of their chief Big Foot. The corpse of Big Foot in the snow. Photo, 29th December 1890.