sentences:  The last remaining pocket of PAVN at the southwest corner of the Citadel was eliminated in an attack by the 4th Marine Battalion in the early hours of 25 February.From 11 March to 7 April 1968 the Marine Brigade participated in Operation Quyet Thang in Gia Định Province with the Airborne Division and the US 199th Light Infantry Brigade to reestablish South Vietnamese control over the areas immediately around Saigon in the aftermath of the Tet Offensive.After midnight on 20 September during the Phase III Offensive, the VC 1st Battalion, 272nd Regiment, attacked a Regional Forces outpost in Phước Tân hamlet, 20km west of Tay Ninh City, losing 35 killed in the brief assault.