Tactics for the Stronghold.

If you start with a large amount of resources, you can build a Monster Lair on the 2nd day! For a rush strategy, it's also good to take Ogres and Orcs into battle. This combination works quite well; the Monster Lair provides a defense reduction, and since heroes aren't leveled up quickly during a rush, the monsters will primarily rely on their own skills, plus a small attack and defense bonus from the hero (though this is unlikely to be significant). Orcs are strong in the early stages, and Ogres can be used to fly over the Fortress wall.