Civil War Union Brigadier General. He graduated from the United States Military Academy at West Point, New York in 1851, placing 1st in his class of 42 (the class contained future Union Generals James StC. Morton, Kenner Garrard and William Whipple, as well as future Confederate Generals Benjamin H. Helm, Junius Daniel and Laurence S. Baker). As per Army custom, as one of the top graduating Cadets, he was posted to the Corps of Engineers, and worked on the building of Boston Harbor's Fort Warren. Resigning in 1855, he pursued a successful civil engineering career until the outbreak of the Civil War in 1861. In May 1861 he was commissioned Lieutenant Colonel of the 2nd Massachusetts Volunteer Infantry, serving with the unit in the Shenandoah Valley in the Spring of 1862. In June 1862, upon the promotion of Colonel George H. Gordon to a Brigadier Generalship, George Andrews was advanced to Colonel and commander of the 2nd Massachusetts, which he led with skill in the 1st Battle of Winchester, Virginia and the subsequent retreat of Major General Nathaniel Bank's forces (General Banks praised him highly in his Official Report of the action). He commanded his regiment in the Battles of Cedar Mountain and Antietam, where the unit participated in the brutal slaughter in the Cornfield, and along the VI Corps line near the Dunker Church. In November 1862 he was promoted to Brigadier General, US Volunteers, and was assigned as General Banks' Chief of Staff, where he took part in the Union Amy operations at Port Hudson, Louisiana. When the Confederates in Port Hudson capitulated after a siege on July 9, 1863, he was detailed to take their formal surrender. He remained in the Gulf States for the rest of the war, raising and commanding African-American troops for the Union Army, and serving as Provost Marshal General for Major General Edward R.S. Canby's Army in the District of the Gulf. He was mustered out in August 1865, having received a brevet of Major General, US Volunteers for "faithful and meritorious services in the campaign against Mobile and its defenses". After the war he served as United States Marshal for Massachusetts and as a Professor at West Point. He retired in 1892 and passed away in Brookline, Massachusetts.