Britannia

[wooly_mammoth]

200.000 denarii?! O.O

I've never had more than 30.000 denarii when I played the gauls, and I'm half-way through my campaign with the germans with similar monetary perspectives.

Anyway, I think Britannia has the easiest time against legionary armies. Chosen swordsmen, provided they get the bronze smithy upgrades and the chevrons from the temple of Andrasta can actually beat by a comfortable margin a silver wep/armor legionary cohort, so just make a line of chosen swords, warcry and clash it against the roman line and then flank with the heavy chariots. I tried a version of this back when I played Egypt, just had a column of chariots on manual control ordered to run back and forth like a lawn-mower through the roman army, pushing it into the phalanx. It's extremely effective since the romans don't have a real counter to chariots but you must:

a) always order the chariots to keep running through the enemy and never stop to fight, because that's when they get bogged down and destroyed.

b) keep in mind that this strategy doesn't work really in forests, given how slow and ineffective chariots are among trees.

You also have head-hurlers that ignore armor with their missile attack.