He joined the Texas army as a volunteer November 8, 1835, in Captain John G. Swisher's Company and participated in the Siege of Bexar (December 5-10) later that year. He was transferred shortly after to another unit and fought at San Jacinto as a member of Captain Jesse Billingsley's Company of Mina Volunteers on April 21, 1836. His military service continued through the rest of 1836, serving in Captain William M. Eastland's Company as a volunteer in the First Division of the troops in the campaign against the Waco and Tehuacana Indians (July 25 - September 13). He left the service with the rank of colonel. Pace died on July 2, 1876 while living in Travis County and is buried alongside his wife Elizabeth in Austin's Oakwood Cemetery.
30° 16.642, -097° 43.605