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

The AI isn't so dumb that it always moves as the player wants. And in battles, it doesn't just let the player's mages with a magic power of 6 or higher cast Lightning Bolt on its titans in one turn.
I remember when Roland attacked a castle with 12 titans with a magic power of 5 and 5 armies, 2 of which were very fast, led by a warlock with high magic power (I don't remember the details). The only way to avoid losing anything was to split the titans into 4 groups, cast Armageddon!, and finish off the 4 surviving armies with the titans.