The Siege of Béxar began in late October 1835, as Texian forces sought to capture San Antonio de Béxar from Mexican General Martín Perfecto de Cos. This strategic city was held by Mexican troops and represented a crucial stronghold for the Mexican government in Texas. Texian leaders such as Stephen F. Austin and James Bowie played key roles in organizing the siege, which involved a series of skirmishes and encirclement tactics. As the days turned into weeks, supplies dwindled, and morale became a concern for the Mexican forces. The Texians, however, were motivated by their desire for self-determination and encroachment of Mexican authority into Texas. By early December, Texian forces mounted a final offensive against Cos's position. Surrounded and heavily outnumbered, the Mexican troops surrendered on December 9, 1835, resulting in a significant Texian victory.

This battle not only signifies the Texians' military prowess but also marked a pivotal moment in the Texas Revolution. The victory at San Antonio boosted Texian morale and solidified the resolve among those who sought independence from Mexico. After the siege, the Texian Army controlled the area, which allowed them to formulate plans for further confrontations with Mexican forces. The successful capture of the city resulted in the disbanding of Mexican forces in Texas and escalated tensions that would lead to further conflict, including the pivotal Battle of San Jacinto in 1836.