At the beginning of World War II, when the Nazi invasion of Poland on 1 September 1939 began hostilities in Europe, President Franklin D. Roosevelt immediately declared the United States’ neutrality. The Neutrality Patrol, organized on September 4, 1939 as a response to the war in Europe, was ordered to track and report the movements of any warlike operations of belligerents in the waters of the western hemisphere. To augment the fleet units already engaged in the Neutrality Patrol which President Roosevelt had placed around the eastern seaboard and Gulf ports, the United States Navy recommissioned 77 destroyers and light minelayers which had lain in reserve at either Philadelphia or San Diego.