War machines in Heroes V.

He would always destroy the catapult with some Implosion spell, a mage with 1000 damage on the spell... and all the attacking units would just pass by. And very rarely would anyone manage to reach them with monsters.

Here, for example, you destroy the catapult right away, meaning you already have a decent army. Then you attack the archers, or wait until they run out of arrows and mana. You attack the flying units. As we found out, there aren't many of them (except for necromancers). And since you can't destroy the walls or gates (not everyone has Earthquake), your towers and 2 heroes will keep attacking each other until they're exhausted. At that point, I think any gentleman would open the