Why did Houston not send more troops to defend the Alamo?

Houston did not send more troops to defend the Alamo because he believed that the fortification was not strategically defensible and that a stronghold there would only serve to delay the inevitable defeat against the larger Mexican army. He prioritized consolidating Texian forces and retreating to a more advantageous position to regroup and prepare for a decisive battle. Additionally, he was concerned about the morale and readiness of his troops, recognizing that a direct confrontation at the Alamo could lead to significant losses that would weaken the Texian cause.