Cristeros
The Cristeros Rebellion took place in Mexico between 1926 and 1929 in response to increasing persecution of the Church by the government of Plutarco Elias Calles. You can read more about it at the Wikipedia article Cristero War.
I came across this fascinating video via Hallowed Ground. It includes interviews with those who were involved at the time.
I came across this fascinating video via Hallowed Ground. It includes interviews with those who were involved at the time.