Who wrote a letter from the Alamo? Describe the letter. What was he asking for in the letter? How many Mexican soldiers did he say were holding them under siege? Who was the leader of the Mexican troops and what did he demand?

my answer so far;
The person who wrote the letter from the Alamo was a man named William Travis. The letter was a plea for help because they (Travis and the Texian rebels with him) were under siege but little help came. They had 350 Mexican soldiers under siege. The leader of the Mexican troops was a man named Santa Anna, he demanded
I need to complete the last sentence. Can anyone help?

He demanded total surrender.

The leader of the Mexican troops, Santa Anna, demanded their unconditional surrender.