Tactical techniques for conducting battles in Heroes of Might and Magic II.

Liches have a defense against spells – antimagic. Cast a spell on them, and they're done for.
Necromancers are good in every way, except for their speed, which is reduced due to zombies and skeletons. But in battle, it is precisely these units that can turn the tide (teleporting hundreds of skeletons behind the walls is brutal).