Custer took command in 1866 and led the regiment through the initial years of the Plains campaigns.

The regiment was responsible for the Washita Massacre of November 27, 1868 — an attack on the village of Cheyenne chief Black Kettle on the Washita River in present-day Oklahoma.

Black Kettle’s village was not a camp of warriors preparing for battle.

Black Kettle was a peace advocate who had tried repeatedly to maintain good relations with the United States.

His camp flew both an American flag and a white flag of peace when the Seventh Cavalry attacked in the predawn darkness.

The attack killed an estimated 150 Cheyenne, including women and children.