The French military command ruthlessly applied the principle of collective responsibility to villages suspected of sheltering, supplying, or in any way cooperating with the guerrillas. Villages that could not be reached by mobile units were subject to aerial bombardment. FLN guerrillas that fled to caves or other remote hiding places were tracked and hunted down. In one episode, FLN guerrillas who refused to surrender and withdraw from a cave complex were dealt with by French Foreign Legion Pioneer troops, who, lacking flamethrowers or explosives, simply bricked up each cave, leaving the residents to die of suffocation.
