Key Facts
- Dates
- 10 July – 25 August 1944
- Duration
- Approximately 46 days
- Location
- Driniumor River, near Aitape, New Guinea
- Campaign
- Western New Guinea campaign, World War II
- Japanese objective
- Retake Aitape from U.S. forces
Strategic Narrative Overview
Japanese forces launched repeated assaults across the Driniumor River beginning 10 July 1944, achieving some initial penetrations of U.S. defensive lines. American troops counterattacked over the following weeks, containing the breakthroughs and methodically pushing back the Japanese. The fighting was intense, involving close jungle combat across several weeks as U.S. forces gradually regained the initiative and compressed the Japanese attacking elements.
01 / The Origins
By mid-1944, Allied forces had landed near Aitape in New Guinea as part of the Western New Guinea campaign, cutting off large Japanese formations to the east. The Japanese 18th Army, stranded and under pressure, resolved to retake Aitape in order to restore its supply lines and relieve encircled troops. This decision set the stage for a major Japanese offensive against U.S. defensive positions along the Driniumor River.
03 / The Outcome
By 25 August 1944, the Japanese offensive had been fully repulsed, with the attacking forces suffering heavy casualties and failing to retake Aitape. The remnants of the Japanese 18th Army were left in an even more precarious strategic position. U.S. forces consolidated their hold on the area, and the Aitape–Wewak campaign, launched in November 1944, would continue pressure on the remaining Japanese forces in the region.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.