If you just want a scattering of reprisals here and there, no leader needed.
If you want to wipe out the enemy, a leader is needed to define the mission, recruit members, inspire action, provide strategy, adapt to changing conditions, communicate with each other, etc.
Just like on the battlefield.
I'm not advocating anything. IMO, if you or anyone wants to see this happen, then you have to take out the enemy entirely and quickly. That requires leadership.