The 1st Texas Infantry Regiment was a Confederate States Army regiment from Texas which was active from August 1861 to April 1865. The regiment was assembled at Richmond, Virginia, with twelve companies from Marion, Cass, Polk, Houston, Harrison, Tyler, Anderson, Cherokee, Sabine, San Augustine, Newton, Nacogdoches, Galveston, and Trinity Counties being raised throughout the war. The regiment fought alongside the Army of Northern Virginia from the Battle of Seven Pines in 1862 to the Battle of Cold Harbor in 1864, although it was briefly detached under James Longstreet, fighting at the Battle of Chickamauga and the Knoxville Campaign before returning east to fight in the Siege of Petersburg and the Appomattox Campaign. The regiment suffered 82.3% losses at the Battle of Antietam and 72% at the Battle of Gettysburg.