John Irvin Gregg was a career U.S. Army officer. He fought in the Mexican-American War and during the American Civil War as a colonel and near the end of the war as a brevet general in the Union army. In 1866, he was nominated and confirmed as a brevet major general of volunteers and a brevet brigadier general in the Regular Army, both to rank from March 13, 1865.
HEADQUARTERS SECOND BRIGADE, October 26, 1863. October 26, 1863—4.30 p. m. Brig. Gen. D. McM. Greae, Commanding Second Division: GENERAL: I have just returned from Liberty. General Buford has fallen…
HEADQUARTERS SECOND DIVISION CAVALRY, August 3, 1864. August 3, 1864. J. IRVIN GREGG, Colonel, Commanding Second Division Cavalry.Respectfully forwarded.No. 227.Report of Asst. Surg. Elias J. Marsh, U.S. Army, of operations…
HEADQUARTERS SECOND BRIGADE, October 24, 1868. October 24, [1863]—10.30 a. m. General GREGG : Colonel Devin reports the enemy advancing in heavy force, pushing forward strong infantry columns, Very respectfully,…