The Germans initial attack involved 410,000 men; just over 1,400 tanks, tank destroyers, and assault guns; 2,600 artillery pieces; 1,600 anti-tank guns; and over 1,000 combat aircraft, as well as large numbers of other Armoured fighting vehicle. These were reinforced a couple of weeks later, bringing the offensives total strength to around 450,000 troops, and 1,500 tanks and assault guns. Between 63,222 and 98,000 of their men were Killed in action, Missing in action, wounded in action, or prisoner of war. For the Americans, out of a peak of 610,000 troops, 89,000 became casualties out of which some 19,000 were killed. The "Bulge" was the largest and bloodiest single battle fought by the United States in World War II and the second bloodiest List of battles with most United States military fatalities.
Question: How many more artillery pieces were there compared to anti-tank guns in the initial attack?
Answer: 1000