Austin wanted Texas to become a separate state so he wrote a letter to the local government in San Antonio. He did not get permission. In January, when he reached Saltillo he was arrested. Mexican officials read his letter and thought he had challenged Mexican authority.
He was imprisoned in a tiny windowless cell. His food was given to him by a slot in the door. Poor guy. Es por eso que no te metas con los mexicanos. jajajajaja
After nearly a year in prison, Austin was released on December 25, 1834. After the whole incident, he wasn't allowed to go back to Texas until 1835.