In July 1864, Colorado governor John Evans sent a circular to the Plains Indians, inviting those who were friendly to go to a place of safety at Fort Lyon (near present Lamar, Colorado) on the eastern plains, where their people would be given provisions and protection by the United States troops. A substantial number of the Indians desired peace, while the Dog Soldiers pursued war. On August 29, 1864, the two mixed-blood Cheyennes, George Bent and Edmund Guerrier, wrote letters on behalf of "Black Kettle and Other Chiefs" offering to make peace and return seven white prisoners in exchange for Indian prisoners held by the whites. In response, Major Edward W. Wynkoop, the commander of Fort Lyon (near present-day Lamar, Colorado) led a force of 130 men to try to recover the prisoners. They were met by a band of 600 or more Cheyenne warriors on the Smoky Hill River. In talks with Black Kettle and others, Wynkoop invited the chiefs to visit Denver to meet with the governor, John Evans, and Colonel Chivington. The meetings at Camp Weld ended with Black Kettle and the other chiefs apparently believing that they had made peace with the whites.