 Field Marshal Model reported that only 6,500 replacements had been sent to cover the 75,000 casualties suffered during the month of September.General Eisenhower commanded three army groups, totaling eight field armies with 55 divisions; these provided a two-to-one advantage in artillery guns and a twenty-to-one advantage in tanks, and could count on almost 14,000 combat aircraft, as compared to the Luftwaffe's 573.Patton's Third Army was tasked with the capture of Metz and the Lorraine; his first obstacle was Fort Driant, built in 1902 and improved over the years by both the French and the Germans.