page_title: Battle of Wau
section_title: Strategy
hierarchical_section_title: Battle of Wau / Background / Strategy
caption_attribution_description: English: A U.S. military map of the area surrounding the towns of Salamaua And Lae, New Guinea
context_page_description: The Battle of Wau, 29 January – 4 February 1943, was a battle in the New Guinea campaign of World War II. Forces of the Empire of Japan sailed from Rabaul and crossed the Solomon Sea and, despite Allied air attacks, successfully reached Lae, where they disembarked. Japanese troops then advanced overland on Wau, an Australian base that potentially threatened the Japanese positions at Salamaua and Lae. A race developed between the Japanese moving overland, hampered by the terrain, and the Australians, moving by air, hampered by the weather. By the time the Japanese reached the Wau area after a trek over the mountains, the Australian defenders had been greatly reinforced by air. In the battle that followed, despite achieving tactical surprise by approaching from an unexpected direction, the Japanese attackers were unable to capture Wau.
context_section_description: Kanga Force achieved one notable success, in a raid on Salamaua in June 1942, but "apart from that they had done little to harass the Japanese at their Salamaua and Lae bases." They had however managed to threaten the Japanese without provoking them into an offensive against Wau at a time when the Allies did not have the resources to reinforce Kanga Force, and they had provided valuable information. Wau occupied an important place in the strategy of the Commander, Allied Land Forces, South West Pacific Area, General Sir Thomas Blamey, who was concurrently commanding New Guinea Force from Port Moresby. At the time, the Japanese held air superiority over the Solomon Sea, precluding airborne or seaborne operations against the Japanese base at Lae. Blamey therefore decided that he would have to capture Lae with a land campaign. The Bulldog Track would be upgraded to a highway capable of carrying trucks and tanks that could support a division that would advance overland on Lae.
  Lieutenant General Hitoshi Imamura, the commander of the Japanese Eighth Area Army at Rabaul, correctly deduced his opponent's intentions and the strength of Kanga Force and resolved to head off the danger to Lae. He ordered Lieutenant General Hatazō Adachi's Eighteenth Army to secure "important areas to the west of Lae and Salamaua". On 29 December 1942, Adachi ordered the 102nd Infantry Regiment and other units under the command of Major General Toru Okabe, the commander of the infantry group of the 51st Division, to move from Rabaul to Lae and then immediately advance inland to capture Wau. Okabe's force was known as the Okabe Detachment.
  Imamura was up against a resourceful, resolute and aggressive opponent, who also had access to good intelligence. Allied Ultra codebreakers were reading the Japanese shipping codes, and, by 3 January 1943, Allied commanders knew in advance about the force that Adachi was planning to send from Rabaul to Lae, although they did not know the force's ultimate destination. Blamey chose not to wait for this to become clear, but immediately ordered the 17th Infantry Brigade to move from Milne Bay to Wau on 4 January 1943. Its commander—Brigadier Murray Moten—was ordered to assume command of Kanga Force and defend Wau.
caption: The Wau-Salamaua-Lae area. Wau is located lower centre on the map. The Wau-Bololo Valley is the light area, being surrounded by mountains.
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