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.
Screenshot taken during a recent EU Strategus battle. Archers and Crossbowmen are seen manning the wall.
Also seen along the wall here are defender spawn flags (small blue flags). Defenders can choose which flag they want to spawn on by pressing F. Attackers must capture the castle by killing the defenders and putting down their spawn flags also using the F key.