George W. Tumlinson was born 1814 in Missouri. He entered the Texan Artillery under Almeron Dickinson on September 23, 1835. He took part in the Siege of Béxar and was discharged afterward. He reenlisted on December 14 for six months of service in Capt. William R. Carey’s artillery company. Sometime before the siege of the Alamo began, Tumlinson may have left for his home in Gonzales, returning to the Alamo on March 1, 1836, with the Gonzales Ranging Company of Mounted Volunteers. Tumlinson died in the battle of the Alamo on March 6, 1836.
Alexander Somervell was born 1796 in Maryland. In October 1835 Somervell joined the volunteers marching from Gonzales to Béxar and was elected major. He participated in the Siege of Béxar. He enrolled in the Texas army on March 12, 1836, and on April 8 was elected lieutenant colonel of the first regiment of Texas Volunteers, succeeding Sidney Sherman. He participated in the battle of San Jacinto and remained in the army until June 7, 1836. He served briefly as secretary of war in David G. Burnet’s cabinet. He was elected brigadier general on November 18, 1839.
Hiram James Williamson, Alamo defender, sergeant-major of the Alamo garrison, was born 1810 in Pennsylvania. Williamson took part in the Siege of Béxar. He later served the garrison at Béxar as sergeant-major, making him the highest ranking enlisted man in the Alamo. He died in the battle of the Alamo on March 6, 1836.
Ammon Underwood was born 1810 in Massachusetts. He joined the Texas army in October 1835 and traveled to Bexar, where he was involved in a skirmish on October 25. On November 4, one day before the Siege of Bexar, he went on furlough. He died November 17, 1887.
Asa Walker, Alamo defender, was born in Tennessee in 1813. He took part in the Siege of Béxar. He was either wounded in the battle or fell sick afterward. Col. James C. Neill’s return of his men lists Walker as “in hospital.” Walker served in the Alamo garrison as a member of Capt. Robert White’s infantry company, the Béxar Guards. Walker died in the Battle of the Alamo on March 6, 1836. He was a cousin of fellow Alamo defender Jacob Walker.