Traders retaliate 1846 Father DeSmet conducts the first Catholic Mass among the Blackfeet, mainly children are baptized. 1849 War party of 800 Blackfeet attack Assiniboine horse raiders and kill 52. 1860 White settlers begin to enter Blackfeet country. 1863 Annuity payments from the US Government to the Blackfeet do not arrive. Blackfeet send letter of protest to Washington.
Fighting breaks out between the Blackfeet and white settlers.
1869 Malcolm Clark killed by Piegan warriors in retailiation for the killing of Mountain Chief's brother. 1870 Massacre on the Marias River. U.S. Soldiers mistakenly attack the camp of Heavy Runner, a friendly chief, while looking for the murderers of Clark. Blackfeet never face the U.S. Army in battle again. 1872 First school for Blackfeet children opened at Teton River Agency.