My paternal grandfather was in the medical corps in WWI. He was in the first gas attack at Ypres. He died when I was a toddler so I have very few memories of him. My Dad always said that he wouldn't talk very much about what happened in the war. We only heard a few stories.
He brought back quite a few things with him, most of which we donated to the Legion. Most of those items disappeared, likely into private collections, unfortunately.
One story I do remember, told to me by my Dad, was when there was an order to retreat and they were unable to bring their wounded with them, in their haste. The wounded were left lying in a mostly swampy area. When they managed to retake the same ground a few days later, they found many of the wounded up and walking around and except for being a little hungry, mostly in good shape. You see, that swampy area was full of leeches which somehow helped with their wounds and preventing lead poisoning from the bullets. No idea whether or not it was true but I still like the story.
I'm watching the service from Ottawa right now. I am always so impressed with how many members of the public come to watch the proceedings in person; they aren't officially involved in the ceremony but they line the streets and pay their respects to the veterans as they march away from the cenotaph, the able bodied pushing their wheelchair bound comrades in arms.
And, as is typical for Remembrance Day, it is snowing.