He discovered that the main force of the Texian army under Sam Houston was moving east towards Louisiana, and was able to catch up with them at the Brazos River, where he told the men about the details of Goliad and was assigned to Captain William H. Patton's Company. Two weeks later, Hazen fought at the Battle of San Jacinto, fiercely determined to avenge his slaughtered comrades at Goliad. After the battle, he continued to serve the rest of his enlistment, leaving the army for good on November 10, 1836. He traveled to Columbia in Brazoria County to look for property to build a homestead, but sadly died of unknown causes on December 27. He was buried in the Old Columbia Cemetery in what is now West Columbia. His grave went unmarked until 1936, when the Texas Historical Commission placed a granite stone there.
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