It looks like you're referring to a specific version of (v1.5.8), likely a build from the GOG platform.
"Mount & Blade II: Bannerlord v1.5.8 was a major update in the game's journey toward its 2022 full release. This version focused heavily on stabilizing the sandbox experience, introducing the which allowed players to start their journey without the constraints of the main storyline. It also brought significant improvements to the battle terrain system , ensuring that the maps players fought on more accurately reflected their position on the world map, and added several new armor sets and weapon balances to the Calradian frontier." 2. Technical / Patch Note Highlights Mount.&.Blade.II.Bannerlord.v1.5.8.263439.GOG.p...
AI kingdoms became slightly more rational about declaring war when already fighting multiple fronts. It looks like you're referring to a specific version of (v1
Improvements to memory usage and crash fixes specifically for the GOG build. 3. Installation / Troubleshooting Context It also brought significant improvements to the battle
If you need a summary of what changed in this specific build:
If you are trying to play with mods , many older mods were built specifically for v1.5.8, which is why some players still keep this exact version installed today.
If you are looking for a description of what the game was like at this stage: