Well, I just bombed the first level. But hey, being in the 51st percentile isn't too bad, right?
Okay, I've found that spamming archers is a viable tactic. It's also better to have the cavalry wait until the last second before charging for maximum efficiency.
This game was very fun! I found that the best way to defend was by using cavalry charges and dragon fire to draw the enemy commander's attention so he'll stop resurrecting the undead. Makes sense.