Thanks Robert for that information on Silas St. John. From San Antonio, the Military Road and Postal Route ran west to Ft. Inge, just south of current Uvalde, and beyond, then turned towards El Paso. If you are a "Rut-nut" there are many sections that can still be seen. On my next trip on I-10 west from San Antonio, I will stop at Ft. Lancaster to view some of the remaining wagon ruts.
See short video on Big Foot here:
https://www.youtube.com/watch?v=oKCzvEb5vps