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The Allies were also badly deceived about the German will to fight, the German material situation, Hitler's boldness, and the skill of German officers in offensive maneuvers (the American generals in the Allied camp had no experience of defending against a German offensive).
The result of all this was the biggest single battle on the Western front in World War II and the largest engagement ever fought by the U.S. Army. The human losses were staggering: of the 600,000 American soldiers involved, almost 20,000 were killed, another 20,000 captured, and 40,000 wounded. Two infantry divisions were annihilated; in one of them, the 106th, 7,500 men surrendered, the largest mass surrender in the war against Germany. Nearly 800 American Sherman tanks and other armored vehicles were destroyed.
The battle began on a cold, foggy dawn of December 16. The Germans achieved a breakthrough at many points in the thinly held VIII Corps lines. Hitler had counted on bad weather to negate the Allies' biggest single advantage, air power (on the ground, in both men and armor, the Germans outnumbered the Americans).
Hitler had also counted on surprise, which was achieved, and on a slow American response. He figured that it would take Ike two or three days to recognize the magnitude of the effort the Germans were making, another two or three days to persuade his superiors to call off the Allied offensives north and south of the Ardennes, and then another two or three days to start moving significant reinforcements into the battle. By then, the German armor would be in Antwerp, he hoped.
It was his last assumptions that were wrong. On the morning of December 17, Eisenhower made the critical decisions of the entire battle, and did so without consulting anyone outside his own staff. He declared the crossroads city of Bastogne as the place that had to be held no matter what. (Bastogne is in a relatively flat area in the otherwise rugged hills of the Ardennes, which is why the roads of the area converge there.) Because of his offensives north and south of the Ardennes, Ike had no strategic reserve available, but he did have the 82nd and 101st resting and refitting and thus available. He decided to use the paratroopers to plug the holes in his lines and to hold Bastogne.
Finally, Eisenhower blasted Hitler's assumptions by bringing into play his secret weapon. At a time when much of the German army was still horse-drawn, the Americans had thousands and thousands of trucks and trailers in France. They were being used to haul men, materiel, and gasoline from the beaches of Normandy to the front. Ike ordered them to drop whatever they were doing and start hauling his reinforcements to the Ardennes.
The response can only be called incredible. On December 17 alone, 11,000 trucks and trailers carried 60,000 men, plus ammunition, gasoline, medical supplies, and other materiel, into the Ardennes. In the first week of the battle, Eisenhower was able to move 250,000 men and 50,000 vehicles into the fray. This was mobility with a vengeance. It was an achievement unprecedented in the history of war. Not even in Vietnam, not even in the 1991 Gulf War, was the U.S. Army capable of moving so many men and so much equipment so quickly.