Besides protecting helicopter troop assaults and supporting ground actions, the Mi-24 also protected convoys, using rockets with flechette warheads to drive off ambushes; performed strikes on predesignated targets; and engaged in "hunter-killer" sweeps. Hunter-killer Mi-24s operated at a minimum in pairs, but were more often in groups of four or eight, to provide mutual fire support. The Mujahideen learned to move mostly at night to avoid the gunships, and in response the Soviets trained their Mi-24 crews in night-fighting, dropping parachute flares to illuminate potential targets for attack. The Mujahideen quickly caught on and scattered as quickly as possible when Soviet target designation flares were lit nearby.