Heroes Walkthrough

It all comes down to speed and gold. Take all the chests for gold, and buy all the heroes of a specific class (warlocks are best), give the starting army to the "leader," and by the beginning of the second week, he should have already captured a couple of castles to buy reinforcements. The rest of the units consume resources and occupy mines. Then it's just a matter of technique. And the larger the army, the higher the chance of finding some friendly neutrals.