Réponse trouvée sur un autre forum, testée et approuvée !!
Go to C:\Users\<USERNAME>\Documents\Mount&Blade With Fire and Sword\
and open rgl_config.txt
Find the line "battle_size =" with a number #
- = battle size of
0 = 30
1 = 150
2 = 270
etc.
Or, algebraically:
Number to Input into the RGL file = (Number of Troops You Want - 30) / 120
So, if you want a battle size of 400:
400 - 30 = 370
370 / 120 = 3.0833333
You would make the RGL line look like:
"battle_size = 3.0833333"