Groups comparison

Battering Ram, a Siege Weapon - 1982 to 2006
A type of siege weapon to destroy or knock holes in city walls or gates.

Siege weapons (Siege engines) - 1982 to 2021
Large weapons designed to circumvent or break fortifications.

Trebuchet - 1982 to 2015
For accurately flinging projectiles up to 140kg at ranges up to 400m. Stones were common, But burning masses & diseased bodies were also used.

Ballistae (Scorpio;Polybolos)[ballistas] - 1993 to 2021
Siege weapon based on 2 levers & torsion springs that launched heavy darts or, less common, round stones or metal projectiles. Also used against infantry (rare).

Catapults (Mangonel;Onager) - 1993 to 2015
A category of siege weapon designed to throw various objects over city walls.

Siege Towers - 1997 to 2015
A mobile/wheeled (if slow) tower built to the height of a city or keep wall in order for numbers of soldiers to scale it & possibly attack city defenders from above on while the tower is moved into place.

Siege Ladders (Assult Ladders) - 2002 to 2015
Sturdy ladders designed specifically for scaling city or keep walls. Might be wheeled & include hooks to attach to the walls.