PD-notice 9 On 12 December at 19:30 a unit of the 1st Brigade on patrol 1.0 miles south of the DMZ inadvertently entered an old U.S. minefield and detonated anti-personnel mines killing six U.S. 13 On 17 December at 08:00 19 km south of Quảng Trị, units of the ARVN 1st and 2nd Battalions, 1st Regiment while sweeping an area where air strikes had been placed on 16 December, found 17 PAVN bodies and 21 huts with connecting tunnels.