William Reid was born around 1837, probably in Scotland. By the early 1860s, he was living in New York. He received a commission as a 2^nd lieutenant in Company F of the 57^th New York Infantry, and he mustered in on August 12, 1861. The regiment took part in the Battle of Seven Pines, the Seven Days’ Battles, and the Battle of Antietam. He eventually earned a promotion to 1^st lieutenant, and he resigned on November 6, 1862. He rejoined the regiment a year later, mustering in as a captain. Union officials transferred him to the 61^st New York Infantry in December 1864, and he mustered out on July 14, 1865. He died sometime after the war.

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