The Alamo, originally known as Mission San Antonio de Valero, is a former Roman Catholic mission and fortress compound, site of the Battle of the Alamo in 1836, and now a museum, in San Antonio, Texas. The compound, which originally comprised a sanctuary and surrounding buildings, was built by the Spanish Empire in the 18th century for the education of local Native Americans after their conversion to Christianity. In 1793, the mission was secularized and soon abandoned. Ten years later, it became a fortress housing the Mexican Army group the Second Flying Company of San Carlos de Parras, who likely gave the mission the name "Alamo". Mexican soldiers held the mission until December 1835, when General Martin Perfecto de Cos surrendered it to the Texian Army following the siege of Bexar. A relatively small number of Texian soldiers then occupied the compound. Texian General Sam Houston believed the Texians did not have the manpower to hold the fort and ordered Colonel James Bowie to destroy it. Bowie chose to disregard those orders and instead worked with Colonel James C. Neill to fortify the mission. On February 23, Mexican General Antonio Lopez de Santa Anna led a large force of Mexican soldiers into San Antonio de Bexar and promptly initiated a siege. The siege ended on March 6, when the Mexican army attacked the Alamo; by the end of the Battle of the Alamo all or almost all of the defenders were killed. When the Mexican army retreated from Texas at the end of the Texas Revolution, they tore down many of the Alamo walls and burned some of the buildings. For the next five years, the Alamo was periodically used to garrison soldiers, both Texian and Mexican, but was ultimately abandoned. In 1849, several years after Texas was annexed to the United States, the US Army began renting the facility for use as a quartermaster's depot. The US Army abandoned the mission in 1876 after nearby Fort Sam Houston was established. The Alamo chapel was sold to the state of Texas, which conducted occasional tours but made no effort to restore it. The remaining buildings were sold to a mercantile company which operated them as a wholesale grocery store.