XL is the combat mode where real battles take place. The smaller team sizes of the other modes are done away with, and each team has hundreds of units at their disposal. There are units everywhere during this type of combat, and you will be constantly fired at from many directions if you show your face. It has rules like a combination between Conquest and Assault, but with larger, more drawn-out battles. The drawback is that it is only available on a few of the maps.