To complete the maneuver, the patrol leader positioned his machine guns to fire on the Communist flanks and directed one platoon to prepare for a frontal assault on the defenders. At 0148, the 1st Platoon attacked from the right. A minute later the 2d Platoon charged headlong at the defenders. Hand-to-hand fighting followed until the Chinese broke contact and disappeared into bunkers within the trenchline. From inside, the CCF soldiers continued the battle, firing through gun revetments and wounding several KMC pursuers in the legs. After 30 minutes had passed, the South Korean assault troops observed enemy reinforcements moving in from the northwest. At 0230, the Marine patrol withdrew under the cover of artillery, reaching its battalion MLR at 0400. The raiders brought back seven civilians found in the area and several Russian-made carbines. At the cost of 2 killed and 18 wounded, the KMCs inflicted casualties totaling 12 counted killed and 25 estimated wounded. Other division patrols similarly took into custody civilians living between the MLR and OPLR. It was also the job of these patrols to destroy buildings that the enemy had used. On the night of 5 April, 5th Marines patrols apprehended 34 civilians, and a wounded enemy soldier. The day before, a patrol from 2/1 had also captured a Chinese soldier. On 12 and 13 April, the enemy stepped up his ground actions. He launched two probes against the 5th Marines occupying the center regimental sector. Both attempts were beaten back. The 1st Marines on the extreme right flank encountered little hostile activity, but in the western KMC sector, Chinese shelling increased noticeably. The following day the artillery picked up again, accompanied by several infantry probes directed against the two KMC frontline battalions. To the right, the Chinese also tested 5th Marines lines again. On the far right, in the area held by the 1st Marines, an air alert was sounded from 0410 to 0726, but no enemy aircraft appeared. By mid-month, the Chinese were dispatching fewer infantry probes but firing a greater number of artillery and mortar shells toward the division line. The enemy even sent 25 rounds to Kimpo, where a total of only 4 had fallen during the first two weeks in April.