Operation Pipestone Canyon

A combined force of ten Marine, ROKMC and ARVN infantry battalions supported by engineers would take part in the operation which was scheduled to commence on or about 27 May.

The five battalions located numerous recently abandoned bunkers and fighting positions which were protected by mines and booby-traps which were methodically cleared, but at least initially their advance was unopposed.

Later that day a PAVN unit attempted to escape to the west, but was unable to penetrate the 1/26 Marines and Ranger blocking positions and instead retreated south towards Go Noi Island.

Once it began moving again the company methodically removed all vegetation, destroying 97 tunnels, over 2000 bunkers and fighting positions and 3.2 km of trenches and flattening 8000 acres of land.

[3]: 178–9 On 19 June Companies B and C 1/1 Marines began a sweep of western Go Noi Island, but their advance was soon delayed by numerous mines and booby-traps.

[3]: 179–80  On 27 June 1/1 Marines conducted a sweep of northern Dodge City finding some PAVN/VC killed in the earlier operation but meeting minimal opposition.

[3]: 182 In early July US intelligence indicated that a PAVN/VC unit had returned to Dodge City and a battalion sized cordon of the village of Tay Bang An (15°53′42″N 108°12′36″E / 15.895°N 108.210°E / 15.895; 108.210) was planned.

The Marines gradually tightened the cordon around Tay Bang An, engaging in small skirmishes with PAVN/VC, eventually killing 20 and capturing 14 by the end of the operation on 17 July.