Those bunkers can't be taken or broken?
flame thrower troops can do damage. you can also destroy them with "undermine research" 500 supply from memory, or by targeting them with siege artillery (200 supply)
Those bunkers are there to make Verdun absolute HELL to even try to take although personally? I'm a bit disappointed I can't build them in other maps. make them expensive at like 300+ supply each but... actually, as i type this I can't think of a way to make players build trenches instead of just placing a line of the verdun bunkers.
I'd still like them to be more than just that one map. But I've no idea how to balance them.