gether a huge task force centered on four fast carriers. A unique message-interception effort code-named Magic enabled the Allies to learn of the enemy move toward Midway, and three American were sent to intercept. In the sea-air battle that followed on 4 June, the Japanese lost all four of their carriers and hundreds of aircraft and pilots. The stunning defeat at Midway was more than a temporary setback. The Japanese Navy never replaced its carrier losses, and as a result its land operations thereafter suffered from a chronic shortage of naval and air support.
But two defeats in rapid succession did not end the threat to Australia. On 22 July a Japanese landing force under Maj. Gen. Tomitaro Horii slipped ashore at Basabua and made its way to Buna on the northeast coast of New Guinea. The landing itself came as a shock to SWPA headquarters, then considering the very same move. Even more disquieting was the discovery that the enemy had landed without air cover.
Operations
Anxious to take advantage of the victory of Midway, Allied staffs drew up an operations plan. Called the 2 July Directive, the plan laid down three tasks: 1. seizure and occupation of the Santa Cruz Islands, Tulagi, and adjacent areas; 2. seizure and occupation of the remainder of the Solomon Islands, Lae, Salamaua, and the northeast coast of New Guinea; and 3. seizure and occupation of Rabaul and adjacent positions in the New Guinea—New Ireland area. The U.S. Navy's South Pacific Area commander assumed the first mission; General MacArthur took up the latter two tasks. To support the Navy in the first task and to execute its own two tasks, SWPA created new commands, moved units closer to target areas, and continued airfield construction and reinforcement, especially at Port Moresby and at Milne Bay on the eastern tip of New Guinea. The U.S. 32d and 41st Infantry Divisions began jungle training, organized in a new corps under the command of Maj. Gen. Robert L. Eichelberger.
Short of aircraft carriers after Midway, the Japanese decided to attack Port Moresby by an overland advance from Buna instead of around Milne Bay by sea. This plan dictated a push through some of the most forbidding terrain in the world. The Papuan peninsula of eastern New Guinea is dominated by the Owen Stanley Mountains, a saw-toothed jungle range reaching a height of 13,000 feet. High temperatures and humidity near the coasts contrast with biting cold above 5,000 feet. Rainfall is typically torrential and can amount to as much as 10 inches per day during the rainy season. Tangled growth
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