As we approach the centenary of the ending of World War 1 on Sunday, there will be more and more coverage of the war in the media. One interesting example is this selection of retouched and colourised photographs from the war. You may be interested in whacking them out to get a sense of some of the sights and experiences Fr Doyle was exposed to during his time as chaplain. 

https://www.dailymail.co.uk/news/article-6357959/Grim-reality-WW1-brought-life-100-colourised-images-mark-centenary.html