Ravenstar submitted this

Build a bridge across a pool of lava to enemy territory. Wait for an enemy creature to walk across your bridge, then sell the bridge. This will make the foe fall into the lava, thus injuring him. Be sure not to do this on beasts impervious to lava.

Another good bridge tactic is to build one that connects to an enemy bridge, then have one of your imps claim the other guys bridge. Combine these tactics for a good, money-making offense.

Snacks for the trainees?