He was born in 1816/17 (2 (44 in 1861)).
He enlisted and was mustered into service on 20 November 1861 (1, 2, 4). He enlisted at Philadelphia, Pennsylvania (2). He was mustered in, at Philadelphia, Pennsylvania, as a private in company I (1, 2, 5).
On 31 May 1880, he applied successfully 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) (William Lockhart)
2 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 30 March 2005 (William Lockhart [rolls have 'Lockheart'])
3 pension index, by name (William Lockhart)
4 pension index, by regiment, 91st PA Infantry, company I (William Lockhart)
5 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (William Lockhart)