Final Fantasy Tactics A2: Grimoire of the Rift/Green Dominion

Set up the units in a formation where the two support units are in the back row. During the mission, only one of the Green Mages actually knows magic, and it's the one that starts the farthest away from you. Take her out as soon as you can, for her abilities are annoying to cure. To minimize the effectiveness of Sleep, keep your units spread out. Your opponents will clump up frequently, making them vulnerable to Black Magic abilities. Don't be afraid to let your White Mage attack rather than heal; this will speed up the battle considerably, and it needs the experience from getting KOs. Your Bangaa can be a "Tank", if you want, drawing most of their attacks. Play cautiously- you outnumber them and should be able to pull off an easy victory.