 Complete the following phrase:  The Valley Guards were incorporated into the 10th Virginia Infantry after the war began. Warren was commissioned lieutet colonel of the 10th Virginia on August 1, 1861. As the lieutet colonel, Warren served at the First Battle of Bull Run, where the regiment served in the brigade of Brig. Gen. Edmund Kirby Smith. He became colonel on May 8, 1862, after Colonel Simeon B. Gibbons was killed at the 