What you see today regarding the Alamo is not a very good exasmple of what it was like. The acual Alamo as it existed in 1836  was about 3 or four Acers and that is why 180 men could not properly defend the walls. After the batlle the mission had been used as a fort so many times that Santa Anna ordered it to be destroyed but those doing it could not bring themselves to destroy the chappel. Afew years ago I visited Bracket Ville Texas and saw the movie set that John Wyne built for his movie. When I looked at the set I wondered why 180 men could not defend those walls. The reason was that I was still looking at a 1/3rd size model.