Yep, that never happened again after the first Christmas of the war. I had an uncle I knew real well (my dad's older brother). He was gassed in the Meuse-Argonne attack just before the Armistice, and his lungs never were right after that.

I just finished reading "To the Last Man" by Jeff Shaara, and I recommend it as a real good WWI novel.

That was a rotten war - maybe even more so than most of them. American soldiers and Marines did an amazing job, and they soon ended a war that couldn't be won by our "allies". At the politicians' level though, it was all about money and greed in every country that participated. World War I didn't accomplish a thing except to bring the Nazis to power in Germany 15 years after it ended.