The west shore of the river was the American perimeter around Aitape, encompassing the town, harbor and Tadji airfield. Today, the area is virtually unchanged since the war.

Americans Build Defenses
Only minor actions took place up to July 1944, as the US garrison was reinforced and built defensive positions along the Driniumor River to meet an expected Japanese attack.  This came in mid-July and the US troops were forced to withdraw.  In the bloody fighting along the Druinimor River the 36th Infantry Division's 124th Infantry Regiment killed more than 3000 of the enemy and played a major part in breaking the back of the by-passed Japanese 18th Army. However, repeated counterattacks restored the position and the Japanese sustained heavy casualties. In further attacks during August the Japanese forces around Aitape were thoroughly defeated, and the scattered remnants fled to the east and south to join the main Japanese force between the mouth of the Sepik River and Wewak.

Japanese Counter Attack
This came in July 9-10, 1944 begining with an attack of the Japanese Army's 128th Infantry Regiment, 32nd Infantry Division. By July 11, over 800 Japanese troops were killed, but they were able to penetrate the line at one area, and for ce US troops to withdraw.

Japanese also attempted to flank south of the American positions by moving inland to Afua in the Torricelli Mountains where fighting raged for two weeks, and was often hand to hand but they failed ot break the line.

Threee Medals of Honor
Three medals of honor were earned in this area. S/Sgt Gerald L. Endl was killed in action after rescuing wounded Americans, and later awarded the Medal of Honor. 2nd Lt. Dale Eldon Christensen single handedly attacked 4 enemy mortars and 10 machine guns on the night of July 18-19, he attempted to repeat an similar attack on August 4, but was killed. For these two actions he was awarded a postumous medal of honor. On July 23, 2nd Lt. George W. G. Boyce, Jr. attacked a Japanese position, throwing himself onto a hand gernade to save his men, and earned a postumous Medal of Honor.

Relief By Australians
Repeated US counterattacks restored the original line, and the Japanese sustained heavy casualties, with the final Japanese attack came on August 4, with 200 attacking and were massicared on the American line. The Americans in the Driniumor River area were relieved by the Australian 2/4th Battalion at the end of November 1944.

Eugene Salternik, 25th Liason Squadron (L-5s) recalls:
"I flew an officer over the battlefield and landed nearby so he could survey the area. I snapped a photo of the area from my L-5, you could see stacks of bodies from the air, it was a massace."