The map included is Passchendaele, which is miserable, muddy, rainy and full of trenches which very accurately describes what the Battle of Passchendaele was like.
Hello Company of Heroes 2 enthusiast! My name is Pigsoup and if you are like me, one of the most attractive aspects of the game is its World War II setting. Monolithicbacon talks about WWI Collection at ~1:20