In Washington, although his eccentricities of dress and manner excited comment, he was always popular on account of his shrewd common sense and homely wit; although generally favoring Jackson's policy, he was entirely independent and refused to vote to please any party leader.

At the end of the congressional term, he joined the Texans in the war against Mexico, and in 1836 was one of the roughly 180 men who died defending the Alamo. Tradition has it that Crockett was one of only six survivors after the Mexicans took the fort, and that he and the others were taken out and executed by firing squad.