Tactics for the Swamp (Fortress).

Lately, I've been spending almost every day playing Heroes 3... and my faction of choice is always Fortress... I just really like them! I usually choose the hero Tyraxor... and I develop in the beginning like this: I build a Town Hall, then Wyverns, then for 2-3 days I develop troops from levels 1-3, and then I can clear the surrounding territory around the castle and capture all the mines. I build a Market, develop Archers and Griffins, then a Capitol - and then I finish building the remaining troops... maybe there are some losses with this tactic...