Da Nang. On 7 February Company D, 1st Battalion, 26th Marines found a PAVN/VC base area near the Nam O bridge northwest of the Red Beach Base Area, leaving the base untouched, they returned at night setting up a series of ambushes that killed 18 PAVN and captured 2. On 8 February patrols from 3rd Battalion, 7th Marines found 7 122mm rockets 14 km southwest of Da Nang and another 13 140mm rockets 2 km further south. On 18 February a Company F, 2nd Battalion, 1st Marines called in artillery fire on a group of PAVN/VC 5 km south of Marble Mountain resulting in 21 secondary explosions believed to be from detonating rockets. Also in mid-February Company D, 1st Battalion, 7th Marines engaged an entrenched PAVN platoon 22 km southwest of Da Nang killing 30 and the ARVN 2nd Battalion, 51st Regiment operating 4 km west of the Marines killed 49 PAVN moving north of Go Noi Island. After midnight on 23 February Company K, 3rd Battalion, 1st Marines and Company D, 1st Military Police Battalion detected VC approaching the Song Cau Do river bridges and attacked them killing 47 and capturing 11. A 70-strong VC force attacked the 2/1 Marines command post 6 km south of Marble Mountain losing 17 dead. To the west of Da Nang, shortly after midnight on the 23rd Company M, 3/7 Marines ambushed a PAVN force killing 10 and later that night a larger force was spotted and artillery fire was called in. On searching the site at dawn it was found that 2 PAVN 81mm mortar teams had been destroyed in the barrage. Before dawn on 23 February, the first day of Tết, the PAVN/VC fired 25 122mm rockets at Da Nang's deep water port hitting an ARVN ammunition dump and a fuel tank farm at Da Nang Air Base and cause minor damage to an A-6A and 6 helicopters at the Air Base. Later that day rockets hit the An Hoa Combat Base destroying 15,000 rounds of artillery ammunition and igniting 40,000 gallons of aviation fuel and 50 rockets were fired at Naval Support Activity Da Nang with more than half going into the sea and the remainder causing minor damage. At dawn PAVN sappers attacked the 1st Marine Division headquarters on Hill 327 and the 2/7 Marines command post to the northwest. These attacks were repulsed for Marines losses of 18