Catapult

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.

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Other Military Units

Military Units
All Ages	Color Guard • Military Drummer • Rogue • / Champion
Bronze Age	Spearfighter • Clubman • Warrior • Horseman Slinger • Stone Thrower
Iron Age	Soldier • Legionnaire • Mounted Warrior Archer • Ballista
Early Middle Ages	Mercenary • Armored Infantry• Barbarian • Heavy Cavalry Mounted Archer • Barbarian Slinger • Catapult
High Middle Ages	Berserker • Heavy Infantry • Knight Crossbowman • Trebuchet
Late Middle Ages	Great Sword Warrior • Imperial Guard • Heavy Knight Longbow Archer • Cannon
Colonial Age	Ranger • Grenadier • Dragoon Musketeer • Field Gun
Industrial Age	Jaeger Infantry • Brave Warrior • Howitzer • Lancer Rifleman • Mounted Brave • Breech Loader
Progressive Era	Conscript • Tank • Armored Car Sniper • Rapid Fire Cannon
Modern Era	Bazooka Team • Battle Tank • Mechanized Infantry Paratrooper • Mechanized Artillery
Postmodern Era	Commando • Universal Tank • IFV MG Team • Rocket Artillery
Contemporary Era	Strike Team • Assault Tank • Attack Helicopter Anti-Aircraft Vehicle • Missile Artillery
Tomorrow Era	Ultra AP • Stealth Tank • Combat Drone Anti-Materiel Sniper • Microwave Blaster
Future Era	Exoskeleton Soldier • Hover Tank • Drone Swarm Satellite Spotter • Rail Gun
Arctic Future	Dragon Drone • Battle Fortress • Behemoth Recon Raider • Surrogate Soldier • Plasma Artillery
Oceanic Future	Manta • Scimitar • C.R.A.B. Mech • Octopod Hydroelectric Eel • Gliders • Sub Cruiser • Nautilus Turturret • Medusa
Virtual Future	Augmented Samurai • Ninja • Rocket Troop • Ronin Bot • Warrior Monk
Space Age Mars	Space Marine • Tesla Walker • Sniperbot • Steel Warden • Sentinel
Space Age Asteroid Belt	Drill Ranger • Nail Storm • B.E.L.T. • Shredder • Hover Hammer

Legend: = Light Unit Class = Heavy Unit Class = Fast Unit Class = Ranged Unit Class = Artillery Unit Class