Reports for duty as first lieutenant with M Company, Fifth Cavalry, Army of the Potomac, April, 1863.

Appointed aide-de-camp to General Pleasanton, commanding First Division, Cavalry Corps of the Army of the Potomac.

June, 1863, at the age of 23 appointed brigadier general of volunteers, in command of the Second Brigade (the “Michigan” Brigade), Third Division, Cavalry Corps, under General Kilpatrick, and distinguishes himself at the battle of Gettysburg. “The boy general with the golden locks.”

Slightly wounded at Culpepper, September, 1863.

Married, February 4, 1864, at Monroe, Michigan, to Elizabeth Bacon, daughter of Judge Daniel S. Bacon, and takes his bride with him to the brigade headquarters camp.

By Sheridan, the new cavalry commander, is given the advance in the various raids.

Transferred to command of the Second Division of Cavalry, and finally September, 1864, to that of the Third Division.

October, 1864, aged 25 is brevetted major-general of volunteers, for gallantry. The youngest in the army.

Continues to lead the Third Division of cavalry, which is conspicuous for its discipline, its dash, and the long hair, cavalier hats and flying red neckties of its men, copied after the well-known Custer garb.