XIX Corps was a corps of the Union Army during the American Civil War. It spent most of its service in Louisiana and the Gulf, though several units fought in Virginia's Shenandoah Valley. XIX Corps was created on December 14, 1862, and assigned to Maj. Gen. Nathaniel P. Banks, the commander of the Department of the Gulf. The corps comprised all Union troops then occupying Louisiana and east Texas. It originally consisted of four divisions, numbering 36,000 men.