At this time there was much political unrest in Texas, as the colonists did not trust Mexican president Antonio López de Santa Anna to abide by the promises that had been made in the Mexican Constitution of 1824. The Mexican government believed that the colonists were preparing to revolt and hand Texas to the United States. After having been held in a Mexican prison for over 18 months, a newly released Austin returned to Texas with stories of what he had seen in the Mexican capital, and on September 19, 1835, he issued a call to arms. The first shot of the Texas Revolution soon occurred at Gonzales. General Martín Perfecto de Cos, the commander of the Mexican army in San Antonio, was distrustful of the Anglos in the area, and on October 16 he placed a guard at the door of the home where Maverick was staying. Maverick, his host John Smith, and another boarder, A.C. Holmes, were forbidden to leave the city. The Texan army soon arrived and, by October 24, had initiated the Siege of Bexar. Maverick had long kept a diary, which provided a "generally faithful eyewitness record of the events" of the siege. During this time, Maverick and his fellow prisoners sent missives to the Texans with information about the occurrences within the city, with many of them going to his childhood friend Thomas Jefferson Rusk.