The Catapult is an excellent long-distance weapon; it is used to destroy the fields and buildings of enemy villages. However, without escorting troops it is almost defenceless so don't forget to send some of your troops with it.
Having a high level rally point makes your catapults more accurate and gives you the option to target additional enemy buildings. With a level 10 rally point each building except for the cranny, stonemason's lodge and trapper can be targeted.
HINT: Fire catapults CAN hit the cranny, trappers or stonemason's lodge when they target randomly.
Fire Catapult (Romans)