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the constitution of 1824 is revoked at the beginning of 1835
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Since Texas was populated mostly by Americans who were accustomed to a federalist government, they expressed their dissatisfaction with Mexico's shift towards centralism, so In October 1835, Mexican and Texan troops clashed in the first official battle of the Texas Revolution.
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The Texians systematically defeated the Mexican troops already in Texas. The last group of Mexican soldiers in the region, led by Santa Anna's brother-in-law, General Martín Perfecto de Cos, surrendered on December 9 after the siege of Béjar.
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When the Mexican troops left San Antonio de Béjar, the Texian soldiers established a garrison at the El Álamo Mission, a former Spanish religious mission that had been converted into a makeshift fortress. Described by Santa Anna as "an irregular fortification, hardly worthy of the name", The Alamo had been designed to withstand an attack by native tribes, but not an army with artillery equipped
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The Texan garrison was undermanned and undersupplied, numbering fewer than 100 soldiers by January 6, 1836. Because of this, Col. James C. Neill, acting commander of the Alamo, wrote to the provisional government that " if there was ever a dollar here, I am not aware of it." Neill asked for troops and supplies, stressing that the garrison would likely not be able to withstand a siege longer than four days.
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Colonist Ambrosio Rodríguez warned Travis that his relatives who lived further south in Béjar had warned him that Santa Anna was heading there. That same day, Juan Seguín's listener, Blas Herrera, reported that Mexican troops had crossed the Rio Bravo
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Despite Texan incredulity, on the afternoon of February 20, many inhabitants of Béjar began to pack their belongings to evacuate.
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Two days later, on February 21, Santa Anna and his troops reached the banks of the Medina de Béjar River. There, dragons (soldiers who fought as cavalry and infantry) were stationed under the command of General Joaquín Ramírez y Sesma, who they had arrived the previous afternoon
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In the early hours of February 23, more inhabitants of Béjar began to flee their homes for fear of the imminent arrival of the Mexican army. Despite not being convinced by reports
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At approximately 2:30 a.m. m. the bell tower began to ring; the soldier who was there claimed that he had seen lights some distance away
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At dawn on March 6, some 1,200 Mexican soldiers divided into four columns attacked the fortification simultaneously from all four cardinal points. Some historians claim that they won the walls in the first assault, while others speak of two waves. In any case, the defenders could not hold such a wide perimeter for long, and the attackers penetrated inside the garrison killing all the defenders