General Gustavus Adolphus DeRussy CDV. At the outbreak of the Civil War, Gustavus was a full-rank captain in the Regular Army having served in the Mexican War. He was highly commended by George B. McClellan during the Peninsula Campaign for bringing "two guns...into action under very difficult circumstances." During the same campaign, he commanded the Artillery Reserve of Heintzelman's III Corps when he earned the brevets of major and lieutenant colonel for his gallant conduct at Malvern Hill and Fair Oaks. DeRussy commanded the guns on Ambroise E. Burnside's left at the battle of Fredericksburg and in March 1863, he entered volunteer service as colonel of the 4th New York Artillery. Henry W. Halleck applied for his services soon after and DeRussy was commissioned Brigadier General of Volunteers and assigned to command the Defenses of Washington South of the Potomac w he remained until the end of the war.Back marked E&HT Anthony, Brady’s National Portrait Gallery.