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tial advisory report, 'an unknown number of grenades were thrown by
unidentified persons, killing 20 demonstrators.' The report failed to
stare whether the unidentified grenade throwers were PF troops or members
of the crowd. The South Vietnamese militia detained 30 people from the
group, 15 men and 15 women, all of whom under interrogation admitted
to being Viet Cong cadre. About three and a half hours later in the
same vicinity, about 200-300 VC Main Force tnxips attacked a village
in the sector. Elements from the 1st Squadron, 1st Cavalry then engaged
the enemy force which broke and fled. Joined by Company C, 7th Battalion,
17th Infantry Regiment from the Americal Division, the U.S. Army troops
eventually killed 36 of the enemy, detained another 18, and recovered
11 weapons.31

At Da Nang, on the 30th, the fighting did not subside with the coming
of daylight. Elements of the VC R-20th and local force units
which participated in the attack on Hoa Vang and I Corps headquarters
attempted to escape the dragnet of Marine and ARVN forces. While the
1st MP Battalion supported by the 1st Tank Battalion established blocking
positions north of the Cau Do River, the ARVN 3d Battalion, 51st Regiment
swept the sector south of the river. Caught east of the Cam La Bridge
and Route 1, on a small island formed by the convergence of the Cau
Do, a small tributary of the river, and the Vien Dien River, the VC
turned to fight. A Combined Action platoon at 0830 saw a number of VC
attempting to swim across the Cau Do to the island.32

By this time, General Robertson, the 1st Marine Division commander, had taken measures to bolster the ARVN south of the Cau Dau. He ordered the 3d Amphibian Tractor Battalion to form a blocking position on the southeastern bank of the Vien Dien River. First Sergeant Jaunal of the tractor battalion's H&S Company remembered that lie received a telephone call that morning 'that a few miles from our area the infantry had some VC or NVA trapped on an island and our Amtracs and Marines were to act as a blocking force.'33

Simultaneously, the division ordered the helilift of a company from
the 3d Battalion, 5th Marines to reinforce the ARVN and the Combined
Action Marines. By 0925 Lieutenant Colonel Rockey, the battalion commander,
had formed a 'jump battalion command group' and had his Company I, under
Captain Henry Kolakowski,Jr., reinforced by mortars, at the battalion
landing zone where four Marine CH-46 Sea Knight helicopters awaited
them. Within a few minutes the helicopters were airborne and then landed
in a flat paddy just south of the island and near the Combined Action
unit which liad taken three casualties. Marine

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