cRPG is a modification for Mount & Blade II: Bannerlord. It adds persistent multiplayer character stats, hundreds of unique items, an online campaign, clans, duel ladder, a co-op game mode and a few more things.
Here we see three catapults deployed by the forces of Assington's Host on strategus in the siege of New Caraf Castle.
Catapults are used to destroy defending walls/towers and kill enemy players. Built using construction sites and construction material the catapults can be moved, turned, aimed, loaded, and shot. Having a skilled catapult squad can greatly increase the chances for a successful siege.
Catapulting can also be practiced in the NA 3 and EU 3 duel servers when there are not Strategus battles happening.