This volume covers the Japanese seizure of the island of Guam in December 1941 and its American recapture by amphibious assault in July-August 1944. Guam was the first Allied territory lost to the Japanese, making its recapture politically and psychologically important. The American invasion in 1944 was the second two-division amphibious assault ever conducted, and this book details the 26-day struggle to recapture the island - one of the most costly battles that the US Marine Corps had so far undertaken.