The Irish Times journalist Ronan McGreevy has done crucial work in creating more awareness about the role of the Irish in World War I. He is the author of Wherever the Firing Line Extends which documents the Irish involvement. I was honoured that Ronan agreed to launch To Raise the Fallen last August, and he delivered a brilliant speech about Fr Doyle at the book launch- you can find it here: https://fatherdoyle.com/2017/08/11/speech-by-ronan-mcgreevy-at-launch-of-to-raise-the-fallen/ has produced an excellent documentary about the Irish involvement in World War I, and in particular about how Irish Nationalists and Unionists fought alongside each other. Fr Doyle features prominently in this documentary.
It is now available on YouTube – the section about Fr Doyle starts around 42 minutes into the programme.