It looks like there are a couple of different philosophies on regional troops. I rather like the idea of using regional armies mainly for defense their settlements (maybe having the occasional client king go raiding if his settlement is being heavily harassed).
I'm getting a little better at shipping factional troops around. It's a bit difficult since they have to go by land. Sweboz also have a fairly small AOR, and their pre-reform troops are unarmored and take horrendous losses against the Polybian Roman troops I've been fighting. It makes things interesting.
Can't really say for most factions since I've recently come back to EB (hadn't played since version .8). In my Sweboz game there are a lot of Celtic regionals that are fun to play with. As far as essential...
In my other thread there was mention of very good cavalry in Gaul if you have a high level MIC. You can also hire Celtic light cav, which is much better than the German cavalry available. In the Alps you can hire those spearmen that are basically poor man's Gaesaetae, which I found very useful, although there is a German equivalent in Silengoz. Teceitos (Celtic axemen) are great as well, with ap weapons, and more durable than clubmen. Hevetii were a lifesaver in an Aedui game I had in 0.8, and are just as useful now.
As far as units that fill niches completely lacking in the German roster, I'd say the best candidates are the Celtic slingers and Baltic frontiersmen, both far, far better than the weak German archers.
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