My Great Grandfather

My great grandfather was fighting as a Canadian in an entrenchment, facing a German defensive entrenchment, with a house between the two, in France. In the middle of the fight, the door opened, and a little girl stepped out. Both sides were surprised as the little girl started playing in the field between them, and held their fire. Eventually, my great grandfather got out of his trench, and brought the girl back inside. Apparently, the house was been owned by a French veteran of a previous war. The French vet. told my great grandfather that he was very thankful, but he had very little to offer; food was scarce, and they had pretty much no cash. So he offered a medal he won, and my great grandfather accepted it, and as he walked back to his lines, the Germans fired not a single shot, out of respect for what he did. The weirdest part is, that as unbelievable as it is, he somehow got a WWI French Army Medal, when he served during WWII with the Canadian Army.
And dad or Grampa, can you please verify that I got the details right? I don't want to take part in this story becoming an exagerated legend.