David L. McNees was from Lawrence County, PA when he enlisted on 10/12/61, mustering in to Company H., 78th PA Infantry. He was discharged for disability on 7/11/64.  He died August 21, 1864.

He wrote the following letter:

29 March 1863
Murfreesboro Tenn., [while the regiment was engaged in provost duty]

a mildly cold morning - everything is in full bloom.  There has been no move in this army yet - General Rosecrans reviewed General Negleys Division this week. There is almost daily skirmishing going on handy here, some thinks that the rebels is going to attack us.  There is also good deal of talk about the rebels invading Kentucky.

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In Jan., 1863, the Army of the Cumberland, under Gen. Rosecrans, was divided into three corps, the 14th, 20th and 21st, and the 78th was assigned to the 3rd brigade (Col. Miller), 2nd division (Gen. Negley), 14th corps (Gen. Thomas).  It was engaged in provost duty at Murfreesboro until April, and in June shared in Rosecrans, campaign from Murfreesboro to Tullahoma.  It then encamped at Decherd until Aug. 15, when it moved with the army in pursuit of Bragg.
Source: The Union Army, vol. 1

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Source: Nate Sanders auction