Code:
;briton rebel army, Hibernia, near Tara
character, sub_faction romans_scipii, Custennyn, named character, age 16, , x 36, y 142
traits Immovable 1, Untouchable 1, Leader_Bonus 1 army
unit barb chieftain cavalry briton exp 2 armour 1 weapon_lvl 1
unit barb cavalry briton exp 2 armour 0 weapon_lvl 0
unit barb cavalry briton exp 2 armour 0 weapon_lvl 0
unit barb cavalry briton exp 2 armour 0 weapon_lvl 0
unit slave briton slinger exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton swordsmen exp 1 armour 0 weapon_lvl 0
unit merc peltast exp 2 armour 0 weapon_lvl 0
unit merc peltast exp 2 armour 0 weapon_lvl 0
unit merc peltast exp 2 armour 0 weapon_lvl 0
unit merc peltast exp 2 armour 0 weapon_lvl 0
unit merc peltast exp 2 armour 0 weapon_lvl 0
unit briton gothic hev inf exp 2 armour 0 weapon_lvl 0
unit briton gothic hev inf exp 2 armour 0 weapon_lvl 0
;briton rebel Garrison, Dalriada, Caledonia
character, sub_faction romans_scipii, Brigomaglos, named character, age 16, , x 45, y 158
traits Immovable 1, Untouchable 1, Leader_Bonus 1 army
unit briton night fighters exp 2 armour 0 weapon_lvl 0
unit briton night fighters exp 1 armour 0 weapon_lvl 0
unit briton night fighters exp 1 armour 0 weapon_lvl 0
unit briton night fighters exp 1 armour 0 weapon_lvl 0
unit briton night fighters exp 1 armour 0 weapon_lvl 0
unit briton night fighters exp 1 armour 0 weapon_lvl 0
unit slave briton slinger exp 1 armour 0 weapon_lvl 0
unit slave briton slinger exp 1 armour 0 weapon_lvl 0
unit slave briton swordsmen exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
;briton rebel garrison(Isca)
character, sub_faction romans_scipii, Berdic, named character, age 30, , x 46, y 129
traits Immovable 1, Untouchable 1, Leader_Bonus 1 army
unit warband huntsman briton exp 2 armour 0 weapon_lvl 0
unit warband huntsman briton exp 2 armour 0 weapon_lvl 0
unit warband huntsman briton exp 2 armour 0 weapon_lvl 0
unit warband huntsman briton exp 2 armour 0 weapon_lvl 0
unit warband huntsman briton exp 2 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton swordsmen exp 1 armour 0 weapon_lvl 0
unit slave briton swordsmen exp 1 armour 0 weapon_lvl 0
unit slave briton swordsmen exp 1 armour 0 weapon_lvl 0
unit slave briton slinger exp 1 armour 0 weapon_lvl 0
unit slave briton slinger exp 1 armour 0 weapon_lvl 0
;briton rebel garrison, Brit. Inferior, Cuniento
character, sub_faction romans_scipii, Morirex, named character, age 32, , x 55, y 140
traits Immovable 1, Untouchable 1, Leader_Bonus 1 army
unit barb chariot heavy slave exp 2 armour 0 weapon_lvl 0
unit barb chariot heavy slave exp 1 armour 0 weapon_lvl 0
unit barb chariot heavy slave exp 1 armour 0 weapon_lvl 0
unit barb chariot heavy slave exp 1 armour 0 weapon_lvl 0
unit barb chariot heavy slave exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton warband exp 1 armour 0 weapon_lvl 0
unit slave briton swordsmen exp 1 armour 0 weapon_lvl 0
unit slave briton swordsmen exp 1 armour 0 weapon_lvl 0
unit slave briton slinger exp 0 armour 0 weapon_lvl 0
If you wish you can add a few more units to the stack. As it is i found the first two battles fun but winnable when taking the chariot heavy town of Cuniento and the massed archers of the Isca. then you need time to lick your wounds and resupply your troops for the eventual push to Dalriada or Tara. You have money this time, due the revamped historicaly accurate resources, but not that much so choose improvements carefuly and know that the battles over Dalriada and Tara will be harder. I've removed as much armour as i can from all troop types(except for main leaders) as none of the town have blacksmiths at game start.