The thing I found about using a lot of low-morale units, in a low-florin game, is to keep them bunched together in close ranks so their morale doesn't fly south as soon as they make contact with the enemy. Plus, when I use my all-peasant army (I use 1 general cav unit, so I guess, if you want to get technical it isn't ALL peasants. hehe) I make sure my general is in the middle of the entire group and using his rally ability as necessary. Otherwise, it is very difficult to win with all-peasants. Plus, you have to hope your opponent brings just a very few expensive cav units and not a lot of swords, or spears, with archers. Fire arrows are murder on those poor little peasants. hehe

I haven't played a 4v4 on 5k yet. Would be interesting. :)