In 1862, Hazen Pingree enlisted in the Union Army to serve in the Civil War with the 1st Massachusetts Heavy Artillery Regiment (Company F). He fought on the front line during General Pope’s Northern Virginia Campaign and the Second Battle of Bull Run. The regiment he fought with was then ordered to defend Washington, D.C. until May 15, 1864, and then was sent to the front again. He fought with the Second Brigade of Tyler’s Division, Second Corps, which participated in battles at Fredericksburg Road (May 18), Harris Farm (May 19), and Spotsylvania Court House (May 19–21).
His regiment was then assigned to the Second Corps, Third Division, in the Army of the Potomac and fought at North Anna (May 24–25) where he and some other men were captured by a detachment of John S. Mosby’s command. Pingree was confined in Confederate prisons at Gordonsville and Lynchburg, Virginia, and at Salisbury, North Carolina. He was then taken to Andersonville prison and, while General Sherman was on his march to the sea, he was taken to Millen, Georgia, where he later escaped by pretending to be someone else during a roll call for a prisoner exchange in November 1864. He rejoined his regiment, fought in many more battles and was present at Appomattox Court House when Robert E. Lee surrendered on April 9, 1865. A few months later, on August 15, his regiment was mustered out.
Source : Hazen Pingree wikipedia entry