About 4,000 kilometers southwest of the Hawaii Islands, the Marshall Islands represented part of the perimeter of the Japanese Pacific empire. The former German colony was given to Japan after the closure of WW1, and had since been an important part of both offensive and defensive plans of the Japanese Navy. By the end of 1943, Admiral Mineichi Koga of the Japanese Combined Fleet knew the Americans were eyeing the islands, but he could not figure out where they would strike. His difficulties were further complicated by the lack of carrier aircraft, as they were taken away from him in an attempt to reinforce land-based squadrons. With his hands tied, all Koga could do was to send his submarines out as forward observers and order the regional commander in Truk Admiral Masashi Kobayashi to reinforce the island garrisons that were most exposed to American attacks. Kobayashi shifted men to the outer islands of Jaluit, Mili, Wotje, and Maloelap. In total, Kobayashi had 28,000 troops available to him in the Marshall Islands. For a garrison that size ground fortifications were sub-par, but that was rather by design at this stage of the war, for that Tokyo had since decided that the Marshall Islands were to serve only as a part of a delay action campaign. The new defensive perimeter was to be established much closer to the home islands.
American intelligence decoded Japanese messages and detected movements for the outer islands, and decided to change the invasion plans. Unbeknownst to the Japanese, the Americans were now bypassing the reinforced outer islands; they were now directly attacking Kwajalein and Eniwetok.
American intelligence decoded Japanese messages and detected movements for the outer islands, and decided to change the invasion plans. Unbeknownst to the Japanese, the Americans were now bypassing the reinforced outer islands; they were now directly attacking Kwajalein and Eniwetok.
The Marshalls, east of the Caroline Islands in the western Pacific Ocean, had been in Japanese hands since World War I. Occupied by the Japanese in 1914, they were made part of the "Japanese Mandated Islands" as determined by the League of Nations. The Treaty of Versailles, which concluded the First World War, stipulated certain islands formerly controlled by Germany--including the Marshalls, the Carolines, and the Marianas (except Guam)--had to be ceded to the Japanese, though "overseen" by the League. But the Japanese withdrew from the League in 1933 and began transforming the Mandated Islands into military bases. Non-Japanese, including Christian missionaries, were kept from the islands as naval and air bases--meant to threaten shipping lanes between Australia and Hawaii--were constructed.
Adm. Raymond Spruance led the 5th Fleet from Pearl Harbor on January 22, 1944, to the Marshalls, with the goal of getting 53,000 assault troops ashore two islets: Roi and Namur. Meanwhile, using the Gilberts as an air base, American planes bombed the Japanese administrative and communications center for the Marshalls, which was located on Kwajalein, an atoll that was part of the Marshall cluster of atolls, islets, and reefs.
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