Published for the first time, this manuscript contains the descriptive letters of a perceptive Pennsylvanian who served throughout the war. The unit saw action in the Second Manassas Campaign, at Antietam, at Gettysburg and in other major battles fought by the Army of the Potomac. In 1863, it served in the famous First Corps and fought on Oak Ridge on July 1. The regiment, which later was assigned to the Fifth Corps, was actively engaged in the 1864-65 campaigning. Since the 107th never had a unit history published, these letters provide the first in-depth look at the 107th Pennsylvania. Richard Sauers labeled this set of letters as "some of the very best Civil War missives that I have ever read."