With long range and an ability to inflict devastating damage, siege engines usually deploy at a safe distance from the main battlefield and work well with scout units. Scouts define a target and siege engineers concentrate fire, sending the enemy into oblivion. In addition to being heavy-missile war machines, artillery units use traps, which can also reduce scythe through enemy units.
Heavy onagers that throw huge stones at enemies constitute the main artillery of Rome. Despite their low mobility, these siege engines can easily unsettle enemy units and force them to disperse from advantageous positions. An onager is mainly used to destroy buildings and walls, and its efficiency against moving enemies — like cavalry or infantry — is somewhat lacking.
Developed from earlier Greek weapons, the ballista is an ancient Roman missile weapon that launches heavy darts or spherical stones of various sizes (only darts in the game). It outperforms other siege weapons due to its ability to shoot projectiles with higher velocities over a longer distance. Its shots can reach their target in no time and are virtually impossible to evade, which makes ballistas especially efficient against infantry, foot archers, and cavalry.
Cheiroballistra shows outstanding results against infantry units. Its great range of fire allows it to deal massive damage, hitting several enemy soldiers with one bolt. Despite its small size, the Cheiroballistra packs a punch and is easy to transport, which allows its engineers to swiftly adapt to the changing tide of battle.
Invented by the Greeks and later adopted by the Roman legions, the scorpion is a smaller catapult-type weapon, capable of cutting down foes at long range, even if they are protected by shields. The weapon supposedly earns its name thanks to its deadly power, comparable in its effect to a scorpion's sting. It has a stringer with a socket to point bolts, uses a system of torsion springs to propel them, and even looks similar to a scorpion. These weapons are typically used against infantry and archers though prove inferior against cavalry attacks and siege weapons.