Custer's three camps are marked along the way, and at one camp on the evening of May 28, 1876, the initials of two of the privates were carved on a sandstone boulder now known as Initial Rock. This was Custer's one-way route to his demise at the Battle of the Little Bighorn. W.C. Williams, Company H, and F. Neely, Company M, who left their initials in the sandstone rock, were with the expedition.