My best, using the combined might of the united tribes:

2 FM (1 General, 1 "Apprentice")
2 Dacian light phalanx
2 Thracian elite (Rhomphoia)
4 Dacian falxmen
3 Thracian peltast
4 Scythian HA
2 Lugoan(sp?) swordsmen
1 Rhaetic axemen (ok, they're foreigners, but I like em)

Lots of high-lethality, ap weapon guys and some mobile archers that can chase surviving routers.