<P> The Zero flown by Petty Officer Shigenori Nishikaichi of Hiryu was damaged in the attack on Wheeler, so he flew to the rescue point on Niihau . The aircraft was further damaged on landing . Nishikaichi was helped from the wreckage by one of the native Hawaiians, who, aware of the tension between the United States and Japan, took the pilot's maps and other documents . The island's residents had no telephones or radio and were completely unaware of the attack on Pearl Harbor . Nishikaichi enlisted the support of three Japanese - American residents in an attempt to recover the documents . During the ensuing struggles, Nishikaichi was killed and a Hawaiian civilian was wounded; one collaborator committed suicide, and his wife and the third collaborator were sent to prison . </P> <P> The ease with which the local ethnic Japanese residents had apparently gone to the assistance of Nishikaichi was a source of concern for many, and tended to support those who believed that local Japanese could not be trusted . </P> <P> Admiral Hara Tadaichi summed up the Japanese result by saying, "We won a great tactical victory at Pearl Harbor and thereby lost the war ." To a similar effect, see Isoroku Yamamoto's alleged "sleeping giant" quote . </P> <P> While the attack accomplished its intended objective, it turned out to be largely unnecessary . Unbeknownst to Yamamoto, who conceived the original plan, the U.S. Navy had decided as far back as 1935 to abandon' charging' across the Pacific towards the Philippines in response to an outbreak of war (in keeping with the evolution of Plan Orange). The U.S. instead adopted "Plan Dog" in 1940, which emphasized keeping the IJN out of the eastern Pacific and away from the shipping lanes to Australia, while the U.S. concentrated on defeating Nazi Germany . </P>

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