George Langdon was born around 1836 in Pennsylvania to David and Charity Langdon. His father was a lumberman who owned $5,000 of real estate and $576 of personal property by 1860. He grew up and attended school in Burnside, Pennsylvania. He married Catherine Baum on February 28, 1857, and they had at least four children: Emily, born around 1857; Ellen, born on February 2, 1859; Marietta, born on July 6, 1860; and Delia, born on February 7, 1862. They lived in Burnside, Pennsylvania, and Langdon worked as a laborer. By 1860, he owned $200 of personal property.
He enlisted in the Union army on September 10, 1861, and he mustered in as a corporal in Company D of the 78th Pennsylvania Infantry. On Octoer 1, 1862, according to one writer, he accidentally shot himself while “returning from a skirmish with the enemy.” Surgeons amputated the arm, but he died in Nashville, Tennessee, on October 10, 1862.