Gang warfare between wasps

Some species carry a version of insect pepper spray in their heads which they use if they are losing a particularly violent fight , so if chasing, biting, stinging, and full on fighting hasn’t worked, as a last resort they spray their opponent to incapacitate them.

This is why foraging wasps will actively avoid going near the nest of another colony, life is too short anyway, and they have work to get on with.