He was 19 years old when he was enlisted (2).
He was enlisted and mustered into service on 12 December 1861 (1, 2). He was enlisted at Philadelphia, Pennsylvania (2). He was mustered in, at Philadelphia, Pennsylvania, as a private in company I (1, 2).
On 19 August 1862, he was transferred to the 11th Connecticut Volunteer Infantry (1, 2).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster) (George Andrews)
2 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 28 March 2005 (George Andrews)
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name cards (searched October 2006). They do have a George W Tarbox, alias George N Andrews, who served in company B of the 10th Connecticut. But according to the 1890 veteran's census, he served from 1864 through 1865, which suggests he is not this George Andrews.]