Hi. I have a relative that was involved in the Cristero Rebellion also. I love reading books about that time. Pedro Quintanar is mentioned on pages 40 - 42 in the book called The Holy War in Los Altos by Jim Tuck. As mentioned in this book, Pedro was upset about the murder of Father Luis Batiz and 3 young men in the ACJM group who were killed by govt. soldiers. Pedro was leading a band of men to rescue them, but arrived too late. 66 years old at the time, he then took control of Chalchihuites, Zacatecas on Aug. 29, 1926 with 30 men at 11 am. They held back Federal soldiers, then a few days later were overpowered. He was injured and went back to his ranch with amnesty, being an ex-army colonel. Apparently, he fought again on Jan. 4 1927 and remained active till the end of the war. His 5-regiment brigade had an amazing fighting record.
This story is also recounted in Spanish with pictures in the book Mejico Cristero by Antonio Rius Facius, published in 1966. What a great guy he was!
Thanks for posting.