 Complete the following phrase:  On September 11, 1861, Sorrel received his commission as captain and was assigned as General Longstreets adjutant-general. He was promoted to major on June 24, 1862 and to lieutet colonel on June 18, 1863. He served under Longstreet until October 1864, when he was appointed brigadier general. Sorrel then commanded Sorrels Brigade of Maj. Gen. William Mahones division at Petersburg and 