Slitherine

The Roman player is only allowed a handfull of units that have sortied from a fortress to engage two armies that together greatly outnumber them.

I choose mostly cavalry to remain mobile, but I can't beat this battle and I'm stuck.

Any advice?

Nevermind, I finally figured-it out.

My cavalry charges the weaker army on the enemy left flank while I hold 2 units of heavy infantry far to the rear of my left flank; while my cavalry is dispatching the weaker enemy army, the stronger enemy army marches forward across the battlefield to enage my infantry, oblivious to the fighting on its left; by the time it finishes w/my infantry, I've eliminated the weaker army and now I just need to turn my cavalry around to inflict enough enemy casualties to satisfy the scenario while keeping my general alive.

RGB has a clever fighting system and, depending on the scenario, this game can be very challenging.

BTW, my bad: it's Massana, not Messena.