If you are in a battle and you are in an enclosed area, there is an easy way to win. If there is an opening with only one way to get to a location, put three guys in a trifecta that is not blocking one space for your enemies to stand.

Put two heavy gladiators horizontally and one light vertically. Make sure the light gladiator has the move "Sand Toss". When an enemy comes to attack, use sand toss and then attack with the other gladiators.