Battle of Phú Lộc
The Battle of Phú Lộc took place from 28 August to 10 December 1974 when North Vietnamese forces captured a series of hills and installed artillery that closed Phu Bai Air Base and interdicted Highway 1 . 
<triplet> Battle of Phú Lộc <subj> 10 December 1974 <obj> point in time