The document summarizes the Battle of Midway between Japanese and United States naval forces in June 1942. Japan's objectives were to seize Midway Island as an air base and draw out the U.S. Pacific fleet for destruction. However, U.S. codebreakers had cracked Japan's naval code and anticipated their attack on Midway. In a major surprise, U.S. carrier aircraft were able to locate and sink four Japanese aircraft carriers on June 4th, turning the tide of the war in the Pacific in America's favor. The battle was a decisive victory for the U.S. and halted Japan's previous string of victories, demonstrating that intelligence advantages and concentration of forces are critical to success in warfare.