From 1909 until 1954 phosphate mining took place on Angaur, originally by the Germans, then the Japanese, and finally by Americans. Angaur is the site of a major World War II battle. The Battle of Angaur was part of the larger offensive campaign called Operation Forager that ran from June to Nov 1944. Many American and Japanese battle relics remain scattered throughout the island. The 7th Antiaircraft Artillery Battalion under Lieutenant colonel Henry R. Paige served as garrison forces for the remainder of the War. Angaur is the only place in Micronesia that has feral monkeys; they are descended from macaques that escaped during the period of German occupation. Thus it is also called Monkey Island.