The Battle of the Alamo was a pivotal event and military engagement in the Texas Revolution. Following a 13-day siege, Mexican troops under President General Antonio López de Santa Anna reclaimed the Alamo Mission near San Antonio de Béxar. About one hundred Texians had been garrisoned at the mission, and they were supplemented by around a hundred subsequent reinforcements, led by eventual Alamo co-commanders James Bowie and William B. Travis. On February 23, approximately 1,500 Mexicans marched into San Antonio de Béxar as the first step in a campaign to retake Texas. In the early morning hours of March 6, the Mexican Army advanced on the Alamo. After repelling two attacks, the Texians were unable to fend off a third attack. As Mexican soldiers scaled the walls, most of the Texian fighters withdrew into interior buildings. On the basis of "perhaps" ten sources, William C. Davis posits three separate escapes of Texian combatants from the Alamo, consisting of perhaps 80 men. Phillip Thomas Tucker also sees three discrete Texian escapes, totaling as many as 120 men.