Why did president Burnet and his cabinet have to leave Washington on the Brazos?

President David Burnet and his cabinet had to leave Washington-on-the-Brazos due to the advancing Mexican army during the Texas Revolution. As hostilities escalated and the threat of capture loomed, they prioritized the safety of the government and sought to relocate to a more secure location. This decision was part of the broader challenges faced by the Texian leadership during the war for independence from Mexico.