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The Battle of Midway was a major naval battle widely regarded as the most important of the Pacific Campaign of World War II. It took place between 4 and 7 June 1942, approximately one month after the Battle of the Coral Sea and six months after Japan's attack on Pearl Harbor. The United States Navy decisively defeated an Imperial Japanese Navy (IJN) attack against Midway Atoll, inflicting irreparable damage on the Japanese navy and seizing the strategic initiative. The Japanese operation, like the earlier attack on Pearl Harbor, aimed to eliminate the United States as a strategic Pacific power, thereby giving Japan a free hand in establishing its Greater East Asia Co-Prosperity Sphere. It was hoped another demoralizing defeat would force the U.S. to negotiate an end to the Pacific War on conditions favorable to Japan.