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
Battle of Stony Lake but having failed to surprise him, the Sioux probed for weak spots. Colonel James H. Baker's 10th Minnesota Regiment was in Sibley's van and advanced, firing volleys and supported by two mountain howitzers. The Sixth Minnesota and Seventh Minnesota Regiments deployed to the left and right of Sibley's wagon train. Charges by companies of infantry dislodged the Indians from several hills. Shortly, the Sioux gave up the battle and faded away. Sibley was unable to pursue them as his horses and men were tired. Sibley did not suffer any casualties. Sioux casualties are unknown, but probably light. Three Indians were