By late October 1972 the ARVN had recaptured Quảng Trị and held a line along the Thạch Hãn River. An attempt to advance to the south bank of the &lt;a href="Th%E1%BA%A1ch%20H%C3%A3n%20River"&gt;Cam Lộ/Cửa Việt River&lt;/a&gt; was repulsed in November. On 15 January 1973 the South Vietnamese Joint General Staff began planning began for a final assault by South Vietnamese Marines and ARVN to capture the south bank of the Cam Lộ/Cửa Việt River and the Cửa Việt Base. The attack was launched on the morning of 26 January and by 07:00 on 28 January the South Vietnamese had recaptured the base. At 08:00 Indochina time on 28 January the ceasefire came into effect and US support for the operation ceased. On the evening of 29 January the PAVN counterattacked and by 31 January had recaptured the base. South Vietnamese losses were 40 killed and they claim to have inflicted over 1000 PAVN casualties.