He was 32 years old when he was enrolled (2).
He was enrolled and mustered into service on 4 November 1861 (1, 3). He served as a private in company B (1, 2). He was enrolled at Philadelphia, Pennsylvania (2). He was mustered in as a private, at Philadelphia, Pennsylvania (2).
He was not accounted for when the regiment mustered out (1, 2). According to the pension index, he was discharged on 2 June 1862 (3).
He died on 25 February 1864 at Harrisburg Hospital (3).
On 28 June 1912, Lizzie J McGill (a minor dependent) unsuccessfully applied from California for a pension (3, 4).
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) (John Johnson)
2 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 28 June 2004 (John Johnson)
3 pension index, by regiment (John J Johnson)
4 pension index, by name (John J Johnson)