Japanese landed a force at Gona

Chapter 3 – Higher Policy in the Pacific, April 1942–June 1943
The Japanese landed a force at Gona on the north coast of New Guinea on 21st July and started to advance south-westward against the resistance of Australian troops.
Chapter 4 – The Japanese Advance to Kokoda
About 2.40 p.m. on 21st July 1942, a float-plane machine-gunned the station at Buna. Perhaps two hours and a half later a Japanese convoy, reported at the time to consist of 1 cruiser, 2 destroyers and 2 transports, appeared off the coast near Gona. It was part of a concentration of shipping which Allied airmen had detected gathering at and moving south from Rabaul during the preceding days. About 5.30 p.m. the Japanese warships fired a few salvos into the foreshores east of Gona. The convoy was attacked first by one Flying Fortress without result and then by five Mitchell bombers which claimed to have scored a direct hit on one of the transports. Air attacks continued as landings began on the beaches east of Gona. Darkness then shut off the ships from further attack and the whole scene from further observation.