Horace Arlington Alsbury came to Texas as one of Stephen F. Austin’s Old Three Hundred. He wrote voluminously to important persons in the Texas government and volunteered for numerous military activities. In January 1834 Stephen F. Austin wrote from Monterrey that he was sending by “Mr. Allsbury,” probably Horace, two portrait miniatures of himself to his Texas kin. In late August 1835, after perhaps being at the legislature of Coahuila and Texas in Monclova, Alsbury published a handbill in Columbia, “To The People Of Texas”, warning of Antonio López de Santa Anna’s plans to drive Anglo-Americans from Texas. In the Siege of Bexar (November-December 1835) he was a member of Capt. John York’s Company.
Alsbury was a member of Henry W. Karnes’s company at San Jacinto and was one of the 154 Masons to take part in the fighting. After the battle he joined in the surveillance of Mexican troops retreating from San Jacinto toward La Bahía and Mexico. He returned to Bexar in May 1836 and took his wife and her young son away from the devastated town to Calavero Ranch, on the Goliad road.