All you have to do is: First level....just camp in the trench then buy defense upgrade for trenches twice continue to put all the rest first into mortar upgrades then artillery just build up 2-3 assaults if on offense and send OR build machine gun assault machine gun, then send a sniper out on defense once you get the tanks build nothing but tanks aim ahead of enemy tanks with artillery etc.
Just get a raiding team in the trench and raid them also attack the tanks with artilary and anti tanks before them use gas to kill soldiers in trenches
