Jack Sumner

[2] He eventually had a falling out with Powell over differences in personality, and was troubled through the rest of his life over the disappearance and deaths of three other men in the expedition.

[6] During the American Civil War, he became a corporal and sharpshooter in the 32nd Iowa Volunteer Infantry, fighting for the Union at Vicksburg and Nashville.

The boat the No Name hit a series of rocks in a rapid and was destroyed, losing food supplies and scientific instruments.

[14] In July, a Nebraska newspaper printed an erroneous story that the entire expedition had been drowned, with Sumner the sole survivor.

As the rapids were becoming increasingly difficult to navigate and food rations were running out, Dunn and the brothers Oramel and Seneca Howland decided to leave the expedition, climb the canyon, and walk to a Mormon settlement.

[4][21] After arriving, he supported himself as a trapper and prospector, but accumulated debts that eventually made it difficult for him and his siblings to inherit the family farm.

[3][4] He was found the next day, bloody and unconscious, and taken to St. Mary's Hospital in Grand Junction, where his wounds were successfully treated by a surgeon named Knud Hanson.

[4][24] The Rocky Mountain News in Denver reported incorrectly that Sumner had been stabbed during a robbery,[4] but Hanson wrote in his records that "He did this while in a state of despondency.

"[4] Hanson later wrote that Sumner had performed the castration very precisely, accounting for his survival, and that he may have done so "at a time of supposed temporary insanity".