 Later that day, U.S. Marine helicopters from HMM-165 brought part of the ARVN 4th Battalion, 2nd Regiment from Đông Hà Combat Base into the Citadel.Eight CH-46 Sea Knight helicopters made the flight in marginal weather with a ceiling and visibility, arriving at an improvised landing zone under enemy mortar fire.The deteriorating weather forced the squadron to cancel the remaining lifts with about half of the battalion in the Citadel.