Each Faction does not have a fixed army roster , as we well know in the world of fire and ice the loyalty and support of the rulers is variable also we wanted to transfer this to "our" mod....
From now on each province will belong to some Lord for example: the house of Royce which are located in Runestone , in this province you can recruit Royce units , if for example: the Lanisters take over this settlement they will be able to recruit Royce units , because the Royce changed support to the Lanisters , analogous situation would be if the Martells captured the Castery Rock they could recruit Lanister units .