Passage: Chivalry has similar gameplay mechanics to Age of Chivalry, a Half-Life 2 mod created by some of the same developers. Combat is primarily melee, carried out from either a first person or third person perspective using medieval implements of war: swords, maces, longbows, and other weaponry of the time are used to hack, smash, and rain arrows down upon enemies. The game also features ballistae, catapults, and boiling oil to use on enemies and their fortifications. Online matches are affected through objective-based gameplay, such as breaching a castle gate with a battering ram or looting a foe's camp. While the game does not have a single-player campaign, there are plans to create an offline mode in the future.In the game, the fictional nation of Agatha is in a civil war, with two factions – the Agatha Knights and the Mason Order – vying for control of the region. Players pick their sides and choose from four character classes, each with a different set of skills and choice of weaponry.The game also features large amounts of exaggerated gore.

Question: How can you damage enemy fortifications in Chivalry?
ballistae, catapults, and boiling oil