OK, firstly you will need to open the file RGBS, that is placed in RG\data\scripts\show_me
Look for "Scipion Legions" Under it you will see this:
Code:
monitor_event UnitTrained FactionType romans_julii
and TrainedUnitCategory cavalry
and SettlementName Arretium
and I_TurnNumber < 226
spawn_army
faction romans_julii
character Secundus, general, command 0, influence 0, management 0, subterfuge 0, age 20, x 80, y 87
unit roman light cavalry, exp 0 armour 0 weapon_lvl 0
unit roman hastati, exp 0 armour 0 weapon_lvl 0
unit roman hastati, exp 0 armour 0 weapon_lvl 0
unit roman hastati, exp 0 armour 0 weapon_lvl 0
unit roman princeps, exp 0 armour 0 weapon_lvl 0
unit roman princeps, exp 0 armour 0 weapon_lvl 0
unit roman princeps, exp 0 armour 0 weapon_lvl 0
unit roman princeps, exp 0 armour 0 weapon_lvl 0
unit roman triarii, exp 1 armour 0 weapon_lvl 0
unit roman triarii, exp 1 armour 0 weapon_lvl 0
unit roman triarii, exp 1 armour 0 weapon_lvl 0
unit roman city militia i, exp 0 armour 0 weapon_lvl 0
unit roman city militia i, exp 0 armour 0 weapon_lvl 0
unit roman velite, exp 0 armour 0 weapon_lvl 0
unit roman velite, exp 0 armour 0 weapon_lvl 0
unit roman velite, exp 0 armour 0 weapon_lvl 0
unit roman slinger, exp 0 armour 0 weapon_lvl 0
unit pedites extraordinarii, exp 0 armour 0 weapon_lvl 0
unit equites extraordinarii, exp 0 armour 0 weapon_lvl 0
end
console_command add_population Arretium -2000
console_command add_money romans_julii, -8110
end_monitor
This is the script for the julii faction, if you are playing the brutii (valerii) or the cornelii, look below for their script text
Now, just change the spawning army composition to whatever you want, by copying/pasting the units. Just try not to pass the 20 unit limit. Otherwise the game will crash.