21 July - The Second Battle of Guam in 1944

The Second Battle of Guam (21 July – 10 August 1944) was the American recapture of the Japanese-held island of Guam, a U.S. territory in the Mariana Islands captured by the Japanese from the U.S. in the 1941 First Battle of Guam during the Pacific campaign of World War II. The battle started on 21 July 1944 and went on till 10 August 1944

Source :https://en.wikipedia.org/wiki/Battle_of_Guam_(1944)