Key Facts
- Dates
- 13–14 November 1943
- Duration
- 2 days
- US unit involved
- 21st Marine Regiment, USMC
- Strategic objective
- Clear Numa Numa Trail for airfield construction
- Key terrain gained
- Numa Numa and East–West Trails intersection
Strategic Narrative Overview
After consolidating the beachhead at Koromokina Lagoon and fighting along the Piva Trail, a Marine reconnaissance party identified airfield construction sites beyond the perimeter. Elements of the 21st Marine Regiment advanced to clear the Numa Numa Trail but were ambushed by Japanese forces. Over two days of close combat, Marines brought up reinforcements, sustaining pressure until the Japanese withdrew, ceding control of the strategically important trail intersection.
01 / The Origins
Following the Allied landings at Cape Torokina in early November 1943 as part of Operation Cartwheel, US forces established a beachhead on Bougainville Island. The broader campaign aimed to neutralise the major Japanese base at Rabaul by capturing territory within air-striking distance. Securing the beachhead and advancing inland was essential to constructing airfields that would extend Allied air power across the Solomon Islands theatre.
03 / The Outcome
By 14 November 1943, US Marines held the intersection of the Numa Numa and East–West Trails, opening the way for airfield construction outside the Bougainville perimeter. The Japanese withdrawal allowed Allied engineers to proceed with their plans. Fighting continued nearby at Piva Forks in the days immediately following, as US forces worked to expand and consolidate the defensive perimeter around the new beachhead.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.