The most requested mod of all time is a co-op campaign: You and a friend join the same party, fighting side-by-side in battles against the AI, then return to the map screen to manage fiefs together.
By 2021, Battle Time remained the closest anyone had come. mount and blade warband multiplayer campaign mod 2021
What Battle Time did (pre-2021): It allowed a second player to control an ally's unit in a battle. But it was buggy; the second player often desynced when looting. The most requested mod of all time is
The 2021 Revival: A modder known as "Swyft" released a fork called Battle Time - Epilogue. This version did not add full map-screen co-op, but it introduced a "Mercenary Campaign" mode: The Verdict: In 2021, this was still janky
The Verdict: In 2021, this was still janky. Desyncs happened every 20 minutes. However, for the first time, you could realistically siege a castle with a friend controlling the archers while you led the infantry charge. For hardcore fans, this was the mod to watch.
Mount & Blade: Warband — Multiplayer Campaign Mod (2021) is a community-made mod that adapts Warband’s single-player campaign concept into a persistent, multiplayer-focused experience where players control factions, towns, armies, diplomacy, and sieges in an online persistent map. It aims to blend PvP/PvE combat with strategy and roleplay.
This feature allows players to issue delayed, executable commands to their party, fiefs, or allied NPC lords when they are offline. Commands are processed on a server-wide timer (e.g., every 6 real hours).