The Catapult is an Early Middle Ages artillery unit. It is the last unit to be unlocked in this age.  

Compared to the Ballista, it gains +2 attack, giving it good attack values for an artillery unit. It doesn't gain any defense other than a slightly higher defense against heavy units, making it the weakest unit on a EMA battlefield. 

It is most useful attacking Heavy Infantry. They are effectively used when put on hills and attacking Armored Infantry or other Heavy units, where they can cause serious damage over time.  

The Catapult is followed by the Trebuchet of the High Middle Ages

Usage

The catapult gains attack on hills, making it much more useful. They are especially vulnerable compared to an average artillery unit of another age. In the EMA mounted archers come into play, which are functionally Iron Age archers on horses. These mounted archers can generally reach Catapults on the first turn, effectively giving them a bonus against them. With one hit, Catapults will be reduced to almost zero health, and as a result will have very reduced attack capabilities.

They are also less effective against mounted archers themselves, as the later gains 4 extra defense compared to Iron Age archers. The best way to use Catapults is against Heavy Infantry. Since heavy units are slow, a fast unit can lead the heavy units on a chase while having the catapult hitting them every turn. This theoretically can allow a fast unit and one catapult to win a battle vs up to three full health heavy units.

Catapults are ineffective against the Mercenary, usually doing around one hitpoint if they are in cover. Make sure to have heavy units holding off any fast or light units before they reach the Catapults.

Bugs

Confirmed on PC: In battle sometimes the Catapult will quickly revert to facing a different direction than the way it was facing. For example, a catapult facing the enemy would flash to facing the other direction before reverting back to its original state. Does not have an effect on gameplay.

Image

Catapults in a group

Other Military Units

Military Units
All Ages Heavy Unit Color GuardLight Unit Military DrummerLight Unit RogueFast Unit/Heavy Unit Champion
Bronze Age Light Unit SpearfighterLight Unit ClubmanHeavy Unit WarriorFast Unit Horseman
Ranged Unit SlingerArtillery Unit Stone Thrower
Iron Age Light Unit SoldierHeavy Unit LegionnaireFast Unit Mounted Warrior
Ranged Unit ArcherArtillery Unit Ballista
Early Middle Ages Light Unit MercenaryHeavy Unit Armored InfantryHeavy Unit BarbarianFast Unit Heavy Cavalry
Ranged Unit Mounted ArcherRanged Unit Barbarian SlingerArtillery Unit Catapult
High Middle Ages Light Unit BerserkerHeavy Unit Heavy InfantryFast Unit Knight
Ranged Unit CrossbowmanArtillery Unit Trebuchet
Late Middle Ages Light Unit Great Sword WarriorHeavy Unit Imperial GuardFast Unit Heavy Knight
Ranged Unit Longbow ArcherArtillery Unit Cannon
Colonial Age Light Unit RangerHeavy Unit GrenadierFast Unit Dragoon
Ranged Unit MusketeerArtillery Unit Field Gun
Industrial Age Light Unit Jaeger InfantryLight Unit Brave WarriorHeavy Unit HowitzerFast Unit Lancer
Ranged Unit RiflemanRanged Unit Mounted BraveArtillery Unit Breech Loader
Progressive Era Light Unit ConscriptHeavy Unit TankFast Unit Armored Car
Ranged Unit SniperArtillery Unit Rapid Fire Cannon
Modern Era Light Unit Bazooka TeamHeavy Unit Battle TankFast Unit Mechanized Infantry
Ranged Unit ParatrooperArtillery Unit Mechanized Artillery
Postmodern Era Light Unit CommandoHeavy Unit Universal TankFast Unit IFV
Ranged Unit MG TeamArtillery Unit Rocket Artillery
Contemporary Era Light Unit Strike TeamHeavy Unit Assault TankFast Unit Attack Helicopter
Ranged Unit Anti-Aircraft VehicleArtillery Unit Missile Artillery
Tomorrow Era Light Unit Ultra APHeavy Unit Stealth TankFast Unit Combat Drone
Ranged Unit Anti-Materiel SniperArtillery Unit Microwave Blaster
Future Era Light Unit Exoskeleton SoldierHeavy Unit Hover TankFast Unit Drone Swarm
Ranged Unit Satellite SpotterArtillery Unit Rail Gun
Arctic Future Light Unit Dragon DroneHeavy Unit Battle FortressHeavy Unit Behemoth
Fast Unit Recon RaiderRanged Unit Surrogate SoldierArtillery Unit Plasma Artillery
Oceanic Future Light Unit MantaLight Unit ScimitarHeavy Unit C.R.A.B. MechHeavy Unit Octopod
Fast Unit Hydroelectric EelFast Unit GlidersRanged Unit Sub CruiserRanged Unit Nautilus
Artillery Unit TurturretArtillery Unit Medusa
Virtual Future Light Unit Augmented SamuraiRanged Unit NinjaArtillery Unit Rocket TroopHeavy Unit Ronin BotFast Unit Warrior Monk
Space Age Mars Light Unit Space MarineRanged Unit Tesla WalkerArtillery Unit SniperbotHeavy Unit Steel WardenFast Unit Sentinel
Space Age Asteroid Belt Light Unit Drill RangerRanged Unit Nail StormArtillery Unit B.E.L.T.Heavy Unit ShredderFast Unit Hover Hammer

Legend: Light Units.png= Light Unit Class Heavy Units.png= Heavy Unit Class Fast Units.png= Fast Unit Class Ranged Units.png= Ranged Unit Class Artillery Units.png= Artillery Unit Class

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