Lots of good articles on Canadian brutality in WW1 if you do a search. As for war crimes in particular, here’s one of many articles mentioning how Canadians killed prisoners of war:
https://nationalpost.com/news/canada/the-forgotten-ferocity-of-canadas-soldiers-in-the-great-war
That’s kind of the point: there isn’t an authority on English. The closest we come is a bunch of English elites making up informal rules on grammar, spelling, and pronunciation and judging everyone else for not using their version. … And a bunch of try-hards who enforce their arbitrary and often nonsensical 'rules '.
If it parses, it rolls.