Official servers have 64 people limit but bannerlord online had 1000 people at the same time on campaign map at its release. Bannerlord online is a mod. Game engine can handle 2048 agents. Agents includes players and horses which is the reason for 1000 upper limit. There is also a mod called crusader blade which does exactly what you describe

Want to know how to increase the size of your party in Mount and Blade 2 Bannerlord? Then you have come to the right place. In this video, I will show you so
The teal number is the "final divider for AI lord maximum party size. Ok, the easiest way to increase the maximum party size of every AI character is to edit the teal number. If you want to double the maximum party size, you change the teal number to 40. The lower you go, the higher the maximum party size.
Party Size – Add more troops to your party to increase morale. Leadership – Leadership skill provides a morale bonus. Food Variety – Don’t just feed your troops, feed them well. Recent Events – Winning battles and completing quests helps morale. Pay Wages – Every 168 hours you need to pay wages to your troops and if you don’t you
Carry multiple quivers. I tend to carry a Sword or Great Sword, Bow and two quivers. You can also use the Community Patch mod which has the arrow perks (among others) working.
There are quite a few that claim to raise party size, but that's number of troops per party. bonesrob13. • 4 yr. ago. Lvl 275 Leadership Ultimate Ruler. bonesrob13. • 4 yr. ago. This plus the 250 Steward Skill "Ruler" +1 companion for each town you own; clan leader effect makes your clan an unstoppable force with no need to have to recruit
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mount and blade 2 bannerlord how to increase party size