10% You start the fight surrounded by two different orc factions that are fighting each other. (Orcs vs Orcs)
5% chance: You find a prisoner that wants to join your company after defeating the orc camp. (Orc Prisoner)
75% chance: If you are flagged as a betrayer, your noble house might send a noble force to kill you after destroying the orc camp. You are no longer flagged after that.