nice tips.i have one or two. when using hoplites, put them directly in front of a bridge or a gate. the hoplites should hold this massive blob of enemy troops, while, on a bridge would be archers, a gate would be boiling oil(yes i know, omg you use boiling oil.) this tends to kill everyone. especially on a bridge, because the enemy tends to rout to your side, so cav can kill the enemy that gets by the hoplites.

and when as the barbs(that is gaul, germania, or briton.i think it should work best with germania.) when facing a numerically superior army(preferably romans), set camp at the side of a forest. put some good troops, preferably anything that can hold(when i said germania, spearwarband would be the best unit for this) in a line outside of the forest, but pretty close to it. and hide some good units(axeman, chosen axeman, swordsmen, chosen swordsmen, woad warriors, naked fanatics, stuff like that, high attack[but can really be anything) in the forest, ahead of your main force, but not so close to the edge, so that when the enemy comes by, your guys stand up. when the enemy engages your holding troop, charge your hiding troops into their rear, and watch a quick rout ensue. keep the troops that were hidden together, and just keep charging them into enemies rear, thet other troops track down the routing enemies. that should be it

ps. for the last strategy, you need good cavalry, and never use plain warband, except when against a bad enemy.

hope it helps, and is not too confusing.
RM3