Still remember my last game from years ago. Concentric moats of lava with long drawbridges that raised to the outer side rather than inner. Goblin invasion.

Still remember my last game from years ago. Concentric moats of lava with long drawbridges that raised to the outer side rather than inner. Goblin invasion. Waited till all of them were on the draw bridges. Raised the drawbridges and laughed as the goblins were catapulted away from my fortress, either into the lava or completely out of the local map.