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

Yes, I know they are strong, but I never really enjoyed playing as them... actually, I only play as them in Heroes of Might and Magic IV and V because of their insane strength.
Their tactic, due to the small number of ranged units, is "charge forward and ignore the losses"; I understand that this is justified for them (resurrecting undead after battle + the "Raise Dead" spell or something similar, I don't remember the exact name).