i only know the first 2 lvls, need help for the third, i keep dying, but here is the first 2 lvls, quite simple actually.
Lvl 1: send out your normal packs of guys 3 times, entrenching them and locking them in there. wait. the enemy will surrender.
Lvl 2: entrench 3 packs of normals and lock them in. if you can beat back the enemy, make 1 more normal and send them and 2 entrenched with him to take the other trench and lock them their. wait. they will surrender. a safer way to do this is the exact same as lvl 1, EXACTLY THE SAME! NO CHANGES!
Lvl 3: i dont know, i cant beat it, if i can get some help, it would be much appreciated.
The game is rather simple. It is more trial and error.
What i did was to pack up my trenches with defensive people (Louis gunners if possible, if not, rifleman) and then i send out an assault team, and when they advance out of the trench, send 2 squads of those defensive people already in your trench out to support then. Also, make sure you use support fire (mortar or gas is best) on they're trenches. Once you have taken an opposing trench, or are close to, send artillery in BEHIND the former oppenents trench, that you have just taken. Then when the blast is leveling off, send w/e men you have in the trench forward, and take the opponents ground.
shanghai i think u should wait for a tank so u can summon it and send support like gas and tank bombs o.O i found it easier like that n fun to watch as i own them