Within a few minutes of that bestial incident the remaining snipers had been shot, and the last cornered defenders had been struck down. In all, the three-part assault on the fort took five hours, but the deadly action within the walls is said to have been crammed into thirty minutes. By nine o’clock in the morning of March 6, 1836, the siege of the Alamo was over.Huey » 03 Jun 2022, 8:17 am » wrote: ↑ The final assaults may have been. But, you have no citation. I do. The actual battle for the Alamo lasted 13 days.