Troop Tree is as follows:
Nord Units:
Scouts,
Mounted Scouts,
Svenners,
War Clerics,
Berserkers,
Axemen,
Plate Armour Axemen,
Viking Raiders,
Swordsmen,
Hirdsmen,
Elite Archers,
Mounted Huscarls,
Spear Militia
Vaegir Units:
Boyar Sons,
Dismounted Boyar Sons,
Cossack Cavalry,
Dvor Cavalry,
Dvor Archers,
Berdiche Axemen,
Woodsmen,
Spear Militia
Hussars,
Swadian Units:
Dismounted Ritterbrüders,
Dismounted Halbbrüders,
Sergeant Spearmen,
Ritterbrüders,
Doppelsoeldner,
Heavy Cavalry,
Archers,
Longbowmen,
Sergeant Spearmen,
Bodyguard,
Imperial Knights
Rhodok Units:
Mounted Sergeant,
Guards,
Cleaver Soldier,
Veteran Cleaver Soldier,
Heavy Infantry,
Mailed Knights,
Heavy Cavalry,
Sword and Buckler Men,
Mounted Crossbowmen
Khergit Units:
Heavy Lancers,
Khans Guard,
Guards,
Spearmen,
Foot Archers,
Heavy Foot Archers,
Light Lancers,
Elite Horse Archers,
Dismounted Light Lancer,
Dismounted Lancer,
Dismounted Heavy Lancer,
Sarranid:
Sarranid Warrior,
Mounted Desert Archers,
Mamluke Archers,
Ghulams,
Dismounted Ghulams,
Javelinmen,
Veteran Javelinmen,
Battlefield Assasins,
Guard Axemen,
Royal Mamlukes
Mercenarys:
Guardsman,
Footman,
Skirmisher,
Cavalry,
Infantry,
Crossbowman,
Mounted Archer,
Veteran Cavalry,
Axeman,
Swordsman,
Veteran Crossbowman,
Veteran Mounted Archer,
Gendarme,
Veteran Axeman,
Veteran Swordsman,
Aventurier,
Mounted Yeoman,
Doppelsoeldner,
Enforcer,
Sergeant,
Captain