Unlawful Combatants. Unlawful combatants are individuals who directly participate in hostilities without being authorized by governmental authority or under international law to do so. For example, bandits who rob and plunder and civilians who attack a downed airman are unlawful combatants. Unlawful combatants who engage in hostilities violate LOAC and become lawful targets. They may be killed or wounded and, if captured, may be tried as war criminals for their LOAC violations.
https://www.thebalancecareers.com/law-of-armed-conflict-loac-3332966