Chainsaw Ridge is a highland on the front line of Maeda Highland in the north of Naha City, Okinawa Island, but it has no strategic value from a strategic point of view. Okinawa is shaped like a lying silkworm with its back bowed.

It ends in Kyushu, Japan, and ends in Taiwan Province Province, China, lying across the East China Sea. The island is densely forested, with rugged terrain and limestone caves all over the island, which is especially suitable for defense.

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Once Okinawa falls, the mainland, North Korea and China's coastal areas will lose control of air and sea. The Japanese base camp judged that the US military could not attack Japan until it landed in Okinawa, so the Japanese army attached great importance to the defense of Okinawa. 19411On February 7th, the Japanese navy attacked the American naval base in Pearl Harbor, Hawaii, and provoked the Pacific War.

In the first half of the war, the Japanese army once swept through Southeast Asia. But only half a year later, the war situation quickly reversed. On June 4-7, 1942, the US Pacific Fleet defeated the Nanyun Mobile Force of the Japanese Navy in Midway Island, sinking four main Japanese aircraft carriers in one fell swoop, which dealt a heavy blow to the Japanese army.