Not bad at all! Glad to see someone giving some attention to a war that isn't World War II.
A couple things I'd suggest though: Maybe make the battlefield a bit less flat. Remember that "No Man's Land", that is to say the space between the trench lines, was a chewed-up quagmire of mud, ruts & shell-craters, all of which would make running across it a lot harder, and would add a lot more cover to duck into. Maybe add a few such craters, or even a charred tree or ruined house; Something to break up the landscape so it looks more interesting & isn't quite such a duck-shoot for the defenders on either side.
Another thing I'd suggest is adding firing steps to your trenches, steps at the edge of the trench that raise your blockhead just high enough over the edge of the trench that they can shoot something other than the ground, without exposing their entire body.
All things said though, this looks like a good start to a really fun TDM map! Excellent work!
Poll