Following the Lakota victory at the Little Bighorn, Sitting Bull and Gall retreated to Canada, but Crazy Horse remained to battle General Nelson Miles as he pursued the Lakota and their allies relentlessly throughout the winter of 1876-77. This constant military harassment and the decline of the buffalo population eventually forced Crazy Horse to surrender on May 6, 1877; except for Gall and Sitting Bull, he was the last important chief to yield.