Battles in World of Warriors are turn based encounters, usually featuring teams of 3 vs 3.
The player's team is always displayed on the left hand side of the screen, with the enemy team on the right hand side.
Enemy teams usually consist of Minions, but could also be made up of enemy Warriors if participating in a Social fight or competing in the Tower of Trials.
Selecting a leader applies that warrior's leader skill to the entire team for as long as the leader is alive in battle. Once the leader has been knocked out, the leader attributes go away.