He saw that the convent and hospital, each two stories in height, were made of adobe bricks, and he also noticed a sallyport, protected by a little redoubt, at the southeastern corner of the yard.
They saw beyond the convent yard the great plaza into which they had driven the cattle, a parallelogram covering nearly three acres, inclosed by a wall eight feet in height and three feet thick.

Prisons, barracks and other buildings were scattered about.

Beyond the walls was a small group of wretched jacals or huts in which some Mexicans lived.

Water from the San Antonio flowed in ditches through the mission.
It was almost a town that they were called upon to defend, and Ned and Crockett, after their hasty look, came back to the church, the strongest of all the buildings, with walls of hewn stone five feet thick and nearly twenty-five feet high.

They opened the heavy oaken doors, entered the building and looked up through the open roof at the sky.