Sam Houston ordered the Texans to retreat in march in the year 1836 because his army was not properly trained and were ill-equipped.
When Sam Houston got to Gonzales Texas after he has been chosen as the commander in chief of the revolutionary army discovered that the Texan army will not equipped properly and most of them had no military experience.
Houston had to order the Texan army to retreat to buy more time to train his soldiers, since the Mexican general Santa Anna was heading to Gonzales.
Hence, the reason Sam Houston order Texans to retreat in march in 1836 was because his army was poorly trained.
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