On July 5, 1867, General Grenville M. Dodge and his survey crew plotted the site now known as Cheyenne in Dakota Territory (later Wyoming Territory). This site was chosen as the point at which the Union Pacific Railroad crossed Crow Creek, a tributary of the South Platte River. The city was not named by Dodge, as his memoirs state, but rather by friends who accompanied him to the area Dodge called "Crow Creek Crossing". It was named for the American Indian Cheyenne tribe, one of the most famous and prominent Great Plains tribes closely allied with the Arapaho.