In my last Casse campaign I'd always have a line of spearmen hold the line, and send chariots around and behind the enemy. Charging into their rear would always cause a mass rout. The javelins are almost unnecessary, and they're not that good for chasing down routers - it's all in the "shock and awe" value.
Interestingly, I never lost a single FM in battle during the whole campaign. I'd usually have at least 4 or sometimes 6 FMs per stack.
But definitely, definitely, (as said before by others) keep them moving once you commit to battle. Don't let them get bogged down in melee.
I found Casse FMs about the most useful of all faction bodyguards, given the kinds of factions you'll probably be fighting. Against Aedui/Averni/Sweboz/Lusotana they just carve up. I only had limited experience against Romani and Qarthadast, and never got to fight a Greek/eastern army, so I can't say how well they'd do against these different styles of troops.
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