Beginning on August 4, 1941, they drew up the plan in accordance with strategic policies promulgated earlier that year, outlined in the ABC-1 agreement with the British Commonwealth, and Rainbow 5, the U.S. war plan. The group completed AWPD-1 in the allotted nine days and carefully rehearsed a presentation to the Army General Staff. Its forecast figures, despite planning errors from lack of accurate information about weather and the German economic commitment to the war, were within 2 percent of the units and 5.5 percent of the personnel ultimately mobilized, and it accurately predicted the time frame when the invasion of Europe by the Allies would take place.