In the Rome Total Realism mod, each area has its own distinct units that can be recruited there over time, as well as a diverse mercenary selection to choose from. In order to ensure that my armies were always composed of only the best of the best, I began making what I thought of as "Military Colonies" in order to gain access to units that I wouldnt normally have access to for quite a long while.
First thing I'd do is send out my ships with diplomats to do the usual routine of getting trade rights with everyone while scouting out the map. What I was mainly looking for was a relatively weakly defended city (preferably rebel to preserve trade treaties) in a different region that would allow access to new troop types. Once a suitable site was located, I'd load up a random, unimportant family member with a small but decent amount of units, and have them seize control of it.
You have to keep in mind that this city, being far from your capital (Let alone any of your territory for that matter) will likely be very unhappy for a long time, so this is NOT something you want to do while under any economic hardships. In the initial phases this place WILL be a steady drain on your economy, but given time it will stabilize and eventually provide enough to pay for itself or close to it.
The real profit here is the versatility that these units can provide your military. Doing this can allow you to augment your forces with horse archers, powerful skirmishers, devestating missile troops, and formidable phalanxes. All you need is a steady shipping lane and to occasionaly invest in some infrastructure (And defensive walls to protect said investments) and you'll have a finely tuned combined-arms factory up and running in no time!
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