The Old San Antonio Road has been used by the Mexicans for traveling from the border to the edge of Texas (it basically reaches from one side of Texas to the other), in a safe way. If you want to know which sides of Texas the trail reached to-and-from, you must go back to the "Tell a Tale of a Trail" page. It was in a couple of wars like the Texas Revolution, The Mexican-American War, and a battle when Alonso got his butt handed to him (even though he should have won).