After the short, bitter clash, the surviving North Koreans retreated through the rice paddies and hills leading to the Han River. Companies E and F, supported by A/Tanks, fanned out from their perimeters and mopped up. In 1/5’s zone, Lieutenant Colonel Newton committed Charlie Company against the withdrawing enemy and inflicted more casualties. Kimpo and the surrounding villages were secured by 1000, 18 September. Half an hour later, Lieutenant Colonel Roise ordered Company D, supported by tanks, recoilless rifles, and heavy machine guns, to seize Regimental Objective Dog--Hill 131, which dominated the banks of the Han River north of the airfield. Advancing under cover of naval gunfire, the Marines occupied the high ground unopposed at 1145.[244] [244] 1st MarDiv _SAR_, Annex Queen Queen. In the 24 hours since leaving Ascom City, the 2d Battalion, 5th Marines, had suffered four KIA and 19 WIA in driving over nine miles of hills and rice paddies.[245] The rapid advance cost the North Koreans 100 dead in 2/5’s zone, ten prisoners, and one of the finest airdromes in the Far East. [245] _Ibid._ CHAPTER IX Marine Air Support _Helicopters and OYs in Support--Marine Air Units at Kimpo--Progress of Eighth Army Offensive--Division CP Displaces to Oeoso-Ri--Advance of RCT-1 to Sosa--Reports of Enemy Build-up--Preparations for Crossing the Han_ At 1000 on the morning of 18 September an HO3S-1 helicopter became the first American aircraft to land on Kimpo Airfield since June. Mopping up operations had scarcely been completed, following the enemy counterattack, when Captain Victor A. Armstrong of VMO-6 made a vertical approach with General Shepherd and Colonel Krulak as passengers. They were greeted by General Craig, the ADC, who had just arrived in a jeep. The field was in surprisingly good shape, considering the fighting it had seen within the last few hours. As evidence that the enemy had been surprised, one Russian-built fighter of the Yak III type and two Stormovik type aircraft were found “relatively undamaged” and turned over to Air Force Intelligence.[246] Several other Yaks and Stormoviks had been destroyed by the enemy. [246] 1st MAW, Annex Able. On the return trip, Armstrong was requested by his passengers to fly them across the Han for a preview of the outskirts of Seoul. Except for scattered small-arms fire, the helicopter was allowed to proceed without being molested by the enemy. There were few signs of extensive NKPA preparations to be seen at this time.[247] [247] Maj V. A. Armstrong interv, 16 Mar 55. _Helicopters and OYs in Support_