Kumusi River is a large delta four miles wide, whose waters empty into Nicolette Bay on the north coast of New Guinea between Katina and Laundered villages. To the northwest is the Opi River, Cape Ward Hunt and Mambare River. To the southeast is Gona. The Kumusi River flows westward inland then southward into the Owen Stanley Mountains and crosses the Kokoda Trail at Airdrop.
The mouth of the Kumusi River area was occupied by the Japanese and used as a base area in support of their advance inland. During late 1942, the Kumusi River mouth was used by the Japanese to hide barges traveling down the coast of New Guinea. After the Japanese retreat, the Australian Army advanced to the Kumusi River area by early November 1942.
On November 28, 1942 Col Yokoyama C. O. of the 15th Independent Engineers at Sanananda sent all their landing craft available were sent to the mouth of the Kumusi River to rescue as much of the 41st Infantry Regiment as possible, that had followed the Kumusi River down from the Owen Stanley Mountains at Wairopi down to the coast. On December 1, 1942 the landing craft rescued as much of the force as able, but roughly 500 troops from the 41st Infantry, 1st Battalion including Col. Yazawa were left behind and instead marched to Giruwa to join the defense of the beachheads and made a failed attempt to deliver 200 of the troops to 600 yards east of Gona but were driven off by patrols of the 2/27 Battalion and instead landed at Giruwa and the rest of the rescued force was transported to the mouth of the Amboga River.
American missions against Kumusi River
October 3, 1942 - January 16, 1943
Claimed to be sunk near the mouth of the Kumusi River
U. S. Army in World War II - Victory In Papua Chapter 12 pages 213, 217
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February 4, 2018