Kickass game you got there! Really hard, but i have my fun watching the battles. They are really extroardinary.
Altought i would like to have a weapon of some kind. I know i'd die immediatly, but it would be fun to kill some germans too.
You should put a "Commander Mode" where you decide when to attack and fall back, where you call mustard and artillery attacks, biplane strikes and ect. It would really kick ass! The artillery strikes would'nt be really accurate, tho you could call different styles of strikes.
A Rolling barrage, where the artillery falls a little in advance of the advancing infantry; following them.
A Box barrage, where the arty falls behind the lines, depriving them of re-inforcments.
A Protectiom Barrage, where they bombard a fixed line in the middle of the battlefield to slay the enemy troops.
Of course, the artillery should be quite innacurate and slow-firing.
For another idea, you could maybe have soldiers dig foxholes and wait for a signal to infiltrate enemy lines.
You could also have multiple trenches! Like two trenches and a few observation posts.
But something a little more realistic, could you add the number of KIA, WIA and DOW allied and german?
KIA: Killed in Action (Soldiers killed instantly)
WIA: Wounded in Action (either saved or not.)
DOW: Died of Wounds (didin't do your job)