Winfield Scott Edgerly 27, 1875. From May to September 1876, the 7th Cavalry, including Edgerly, participated in the Sioux Expedition. Edgerly was promoted to first lieutenant in the 7th Cavalry effective June 25, 1876. The regiment was engaged in the Battle of the Little Bighorn on June 26–27, 1876. Edgerly was the second in command of Company D, serving under Captain Thomas Weir; Company D was assigned to Captain Frederick Benteen's Battalion. Prior to the battle, Lieutenant Colonel George Armstrong Custer was discussing upcoming events with his junior officers; Edgerly expressed enthusiasm about the possibility of success; Custer replied that success depended on
George Armstrong Custer agencies (reservations) or be considered "hostile". At that time the 7th Cavalry's regimental commander, Colonel Samuel D. Sturgis, was on detached duty as the Superintendent of Mounted Recruiting Service and in command of the Cavalry Depot in St. Louis, Missouri, which left Lieutenant Colonel Custer in command of the regiment. Custer and the 7th Cavalry departed from Fort Abraham Lincoln on May 17, 1876, part of a larger army force planning to round up remaining free Indians. Meanwhile, in the spring and summer of 1876, the Hunkpapa Lakota holy man Sitting Bull had called together the largest ever gathering of