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It was common practice that if you captured enemy weapons you would use them against them at the time if you could. I heard that Allied troops were trained in the use of German field guns just for this purpose. After said battle the captured weapon then became a war trophy ready to be carved into or painted by the capturing unit. I think the marking on this gun is the equivalent of carving "so and so was here" into a tree. Great piece!
Since the date of manufacture is on the Maxim, you could probably trace it back to where the 4th Canadian Infantry division was and get a rough idea where they captured it.
I'm going to be optimistic and say either Vimy Ridge or Passchendaele.