William Evans was born in Annagh, Ireland, in 1851. He later emigrated to the United States and enlisted in the U.S. Army in St. Louis, Missouri on April 26, 1875. From there, Evans went to Newport, Kentucky where he was sent to the frontier with the 7th U.S. Infantry. Within a year, he would take part in actions against the Sioux in the Montana Territory during the Black Hills War. In the aftermath of the Battle of the Little Bighorn, he and two other soldiers, Pvts. Benjamin F. Stewart and James Bell, volunteered to carry important dispatches between Generals George Crook and Alfred Terry. There had been two previous attempts to get messages though, both unsuccessful, and Evans and his comrades had to pass through 100 miles of territory occupied by an estimated 2,000 Sioux and Cheyenne warriors. Between July 9–14, 1876, they traveled back and forth from Crook and Terry's camps. Hiding during the day and traveling at night, they were able to safely avoid Sioux war parties. For their actions, all three men received the Medal of Honor. Evans remained in the military, reenlisting at Camp Baker on November 2, 1878 and promoted to the rank of corporal on November 30, 1880. He spent the last three years of his life farming in Greeley, Colorado. He died there on November 26, 1893 and was buried at Linn Grove Cemetery.