Catapult

Catapults are most expensive unit you can use. They will hurl stones towards your foes from safe distance, though fighting other Units will not be as effective due to 50% damage reduction but still may be useful thanks to their great range. If enemy spending resources to build defences then it is good idea to send them in along with some meele support to prevent quick destruction with cavalry charge. Note that Catapults are SLOW. They take two Ticks to hurl boulders and to move so they can block bridge if you spawn too many of them next to eachother.