The disastrous defeat at Midway which followed the initial setback in the Coral Sea bad great influence upon Japanese war planning. The Japanese Navy was compelled to revise its planning drastically: strategically from the offensive to the defensive. Its long-contemplated plan of invading New Caledonia, Fiji, and Samoa, and also of launching offensives against Hawaii through Midway, thus aiming to challenge and destroy the American Fleet while still maintaining its favorable strength ratio to the American Navy, eventually came to naught. While the Japanese Navy bad just started strengthening its new strategical position after switching from an active concept of operations to a passive concept, it was completely surprised by the sudden landing of the American forces on the vulnerable Guadalcanal Island in the Solomons.
Japanese Commentary on Guadalcanal
By Captain Toshikazu Ohmae, Imperial Japanese Navy