This is small fix that makes rebel armies look more like commoner uprisings.
Drop this file in your Medieval II Total War\mods\calradiatw2\data.
Current composition:
rebel_type Native_Rebels
category peasant_revolt
chance 3
description Native_Rebels
unit Peasant Archers
unit Peasant Archers
unit Viking Raiders
unit Viking Raiders
unit Viking Raiders
unit Peasants
unit Levy Spearmen
unit Peasants
unit Levy Spearmen
unit Hobilars
Before this fix there were crossbowmen, mounted huscarls and knights in rebel armies.
In vaegir or southeastern regions there are diffrent types of rebels, this fix is for western and northern rebels.