No, these guys worked and traded with the Spaniards. Remember the Mendoza Expedition traveled from present El Paso to around the area of San Angelo in the 1683. All this in the future area of Comancheria. They were searching for thesource of the fresh water pearls of the Concho river. It's an extremely interesting read. I gave my translation to the young son who was working on his Masters thesis at the time.

Bolton translated Mendoza's journal about 1908. Try these links;
http://www.tshaonline.org/handbook/online/articles/fdo52
http://www.highbeam.com/doc/1G1-122260256.html

Jumanos were to be a buffer for Apaches.

Founder
Ancient Order of the 1895 Winchester

"Come, shall we go and kill us venison?
And yet it irks me the poor dappled fools,
Being native burghers of this desert city,
Should in their own confines with forked heads
Have their round haunches gored."

WS