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Ghoul rush
Tactic from MacMark.
The basic idea is simple: Undead has in contrast to the other races a worker – the ghoul – that features useful attack capability (similar is only the militia rush). To surprise the enemey the undead build around a dozen ghouls and goes straight for the enemy workers.
Ghouls can eat dead enemies (cannibalize) to heal themselves. If you want to upgrade your hero before you attack the opponent, you can creep a little bit and cannibalize the dead creeps. Thus your army stays at full health for the next battle. Let the ghouls take the damage, keep your hero behind them, retreat single ghouls before they die and then cannibalize the creeps' corpses.
Don't wait too long. If your opponent has spiked barrickades and towers or the likes it's probably a bit too late. A few tier 1 units are no challenge for your ten or twelve ghouls.
Disclaimer: Caution! Kids, don't try this at home!