Charge: celebrating Mass. Place: Jalisco, Mexico. Year: 1927.
The authenticity of the photo has been challenged. In any event, many priests were
murdered during this period of Mexican history, known as the Cristero War 1926-1929.
Graham Greene wrote a novel about it, The Power and the Glory. He was a newspaper correspondent in various places and spent some time in Mexico.
Below is a picture of Father Miguel Pro, SJ, executed by firing squad on Nov 23, 1927,
in Mexico City. I obtained the picture from Wikipedia.