A snow biome event map set in trenches (If you need to base it then it can be based near Xmas time of the first battle of champagne)
Making all the trenches connected with many routes to go from one direction to the left will take 2-3 passages, same goes for right, true and behind.
A city battle, I know this is much but if there is any history of any small time town battles in WW1 then you can base it on that. I've had little experience with Rfms and LMGs in a few houses put together and it felt like a darn good experience (in first person its nuts!) and mainly a big based city is very... addicting in my opinion to catch peoples attention.