 Milton B. Duffield is probably best known for being the first United States Marshal appointed to Arizona Territory, a post he held from March 6, 1863, to November 25, 1865.A man "of iron nerve, of ruffiantly instinct, and unimpeached aim," Duffield was not well-liked, but he did have a reputation for fearlessness.John Gregory Bourke once described him as wearing "11 firearms and a knife at one time, usually concealed."