The actual battle of San Jacinto lasted less than twenty minutes, but it was in the making for six years. It had its prelude in the oppressive Mexican edict of April 6, 1830, prohibiting further emigration of Anglo-Americans from the United States to Texas; in the disturbance at Anahuac and in the battle of Velasco, in 1832; in the imprisonment of Stephen F. Austin, the "Father of Texas," in Mexico in 1834. Immediate preliminaries were the skirmish over a cannon at Gonzales; the capture of Goliad; the "Grass Fight," and the siege and capture of San Antonio . . . all in 1836. The Texas Declaration of Independence at Washington-on-the-Brazos on March 2, 1836, officially signalized the revolution.