The battle of Velasco, a prelude to the Texas Revolution and probably the first case of bloodshed in the relations between Texas and Mexico, took place on June 26, 1832. Henry Smith and John Austin, in charge of Texans who had gone to Brazoria to secure a cannon for use against the Mexican forces at Anahuac, opposed Domingo de Ugartechea, commander of the Mexican fort at Velasco, who tried to prevent the passage of the vessel carrying the cannon. The Texans numbered between 100 and 150; the number of Mexicans was variously estimated at 91 to 200. Ugartechea and his garrison were forced to surrender when their ammunition was exhausted. Sources differ about the number of casualties, but a conservative estimate suggests that Texan casualties were seven killed and fourteen wounded; three of the fourteen later died of their wounds. The Mexicans had five killed and sixteen wounded. Final terms allowed Ugartechea to surrender with the honors of war and return to Mexico aboard a ship furnished by the colonists. The final surrender took place in camp at the mouth of the Brazos on June 29, 1832, in the form of a document signed by Texas representatives William H. Wharton and William J. Russell, and Mexican representatives Juan Moret and José Rincón, with final approval by Ugartechea and John Austin.