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
Great Sioux War of 1876 actually been a village of Northern Cheyenne (led by Old Bear, Two Moons and White Bull) with a few Oglala (led by He Dog.) In the late spring of 1876 a second, much larger campaign was launched. From Fort Abraham Lincoln marched the Dakota Column, commanded by General Alfred Terry, with 15 companies or about 570 men, including Custer and all 12 companies of the Seventh Cavalry. The Montana Column, commanded by Colonel John Gibbon, departed Fort Ellis. General Crook commanded a third column that departed Fort Fetterman to head north. The plan was for all three columns to converge