Travis knew by March third that the situation at the Alamo was hopeless.
Sometime between the third and fourth he used his sword to draw a line in the sand. In a passionate speech Travis told the Alamo occupants the situation was hopeless and they should decide how they would die. He challenged all those who would fight to the death to cross the line in the sand.
“We must die. Our business is not to make a fruitless effort to save our lives, but to choose the manner of our death.”
All but Moses Rose crossed the line. Rose snuck through the enemy lines the night of March fifth.