A lot of Canadians refused to honour the Christmas truce.
Canadians, on the whole, really dislike war. So, when it happens, they try really hard to get the whole thing over and done with as soon as possible. None of this pissing about with calling time-outs and such. You're here to kill each other, so bloody well get on with it.
Canadians had a vendetta against the germans and refused to even acknowledge their humanity on a whole.
Canadians were the recipients of some of the most brutal german assaults, gas attacks and night raids. As well there was a rumour early in the war that the germans crucified a Canadian in no mans land. Since then all bets were off.
Canadian soldiers used to throw tins of food into German trenches during quiet periods then when the calls came for more they would throw grenades instead. Ensuring they killed as many Germans as possible.
Canadians also perfected night stealth raids where they would sneak into German lines and cut the throats of every other man. Leaving the Germans to wake up to their numbers decimated without a sign of the enemy.
At one conference at the Hague the Germans promised to stop using gas weapons if the Canadians agreed to stop using birdshot in their shotguns and the Canadians said no.
I'm not disputing your claims, but I would like to read more on this. Your comment reads as though you've read up on this and as a Canadian, I'd love if you have some links or sources I could peruse.
You see, I'm approaching 37 and I'm realizing it's time to really get into war histories or I need to go get a smoker soon.