SAN ANTONIO DE VALERO San Antonio de Valero, one of five Spanish missions established by Franciscans in what is now San Antonio, is most commonly known as the site of the battle of the Alamo (1836). The earliest buildings were of temporary construction and have not survived, but by 1727 work had begun on a stone convento, or priest's residence. The two-story, arcaded convento served as the friars' main building; it housed offices, kitchens, dining rooms, sleeping quarters, and guest rooms. Because the Spanish government failed to complete or adequately garrison the local presidio, the mission had frequently to provide for its own defense. Protective walls were erected, apparently after the massacre at Santa Cruz de San Sabá Mission in 1758; these walls, eight feet high by two feet thick, enclosed a main plaza located west of the convento and guarded by small artillery and a fortified gate.