Oi vol2007, if you have an issue with ads, Kong+ seemed to fix that for me. Things like "Mutilate-a-Doll 2" lagged horribly but I upgraded recently and the lag is pretty much eliminated.
Julka, I'd recommend sending in units once they've built up to 2 or more unless you're countering something that's about to cross your side that's easily dealt with. Sending in swordsmen with archers right behind them is always a good pairing, especially if you can line up the charges to happen at the same time and at the same amount. Sometimes you just have to let heavy armor cross your side for the sake of winning the battle if you don't have anything to counter it with. Wasting units on heavy armor just weakens your other flanks.