Frank Crawford Armstrong

Frank Crawford Armstrong was a United States Army cavalry officer and later a brigadier general in the Confederate States Army during the American Civil War. He is also known for being the only Confederate general to fight on both sides during the Civil War.

Armstrong was born on the Choctaw Agency in the Indian Territory, where his army officer father had been stationed. Armstrongs father, Francis Wells Armstrong, died three months before his sons birth. In 1854, Armstrongs mother married MexicanAmerican War General Persifor Smith. In 1854, Armstrong accompanied his stepfather on an expedition of the United States Army troops into the New Mexico Territory. His gallantry in a battle against Indians near Eagle Spring gained him a commission as a lieutenant of the 2nd Dragoon Regiment in 1855, following his graduation from College of the Holy Cross in Worcester, Massachusetts. Armstrong then fought with Albert Sidney Johnston against the Mormons during the Utah War.

Source: Wikipedia