 The 363rd Security Battalion, with strong support from RVNAF fighter-bombers based at Bien Hoa Air Base, fought back fiercely in their attempt to defend Bu Na.However, by the end of the day South Vietnamese defenders around Bu Na gave up, when reinforcements from Phước Long failed to arrive due to the closure of Route 14 by the PAVN.On December 16, Lieutenant General Dư Quốc Đống flew out to Phước Long to assess the situation around the area, and to bolster the defences of Phước Long with the 2/7th Regiment, from the ARVN 5th Infantry Division.