Thanks for the reply.

"order your chariots to charge through an enemy infantry formation"

Do you mean I should order them to run to a point behind the enemy, or get them to charge and then immediately disengage behind the enemy?

I'm about to start a war with the Romans (just got to finnish of the Averni), should I bring along lots of chariots to break up their formations, seeing as that's one of the Roman's key strengths?