Just a comment on the maple leaf carved in the tunnels at Vimy Ridge. According to my tour guide, I'm sure there is a slightly different interpretation with every guide, they are not 100% sure that the maple leaf was carved by a Canadian soldier during the war. The assumption is that it was. I think they said that the caverns were closed off to the public and access was only permitted by guided tour in the 1960's. Before that anybody could have gone below and walked through the caverns at their leisure. That is why there is so much other graffiti down there.
Also there are caverns that are closed to the public that have a lot more carvings from Canadian Soldiers during the war. I saw a program on CBC years ago, possibly the 80th anniversary of the battle, that showed numerous carvings. The one that struck me was a solider from Manyberries (its near where I grew up), who carved his name with the date on the eve of the assault.
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