After the
breakout from Normandy at the end of July 1944 and the
Allied landings in southern France on 15 August 1944, the Allies advanced towards Germany more quickly than anticipated. The speed of the advance of the Allies caused several
military logistics issues: • Troops were fatigued by weeks of continuous combat and rapid movement. • Supply lines were stretched extremely thin. • Supplies were dangerously depleted. By December 1944,
General Dwight D. Eisenhower (the
Supreme Allied Commander on the
Western Front) and his staff decided to hold the
Ardennes region primarily as a rest area for the
U.S. First Army, with limited Allied operational objectives in the area. The Allies defended the Ardennes line very thinly, due to the favorable defensive terrain (a densely wooded highland with deep river valleys and a rather thin road network) and because they had intelligence that the
Wehrmacht was using the area across the German border as a rest-and-refit area for its own troops.
Allied supply issues The Allies faced major supply issues, due to the rate of their advance coupled with the initial lack of deep-water ports. Over-the-beach supply operations using the Normandy landing areas, and
direct landing ships on the beaches, were unable to meet operational needs. The only deep-water port the Allies had captured was
Cherbourg on the northern shore of the
Cotentin peninsula and west of the original invasion beaches, but the Germans had thoroughly wrecked and mined the harbor before it could be taken. It took many months to rebuild its cargo-handling capability. The Allies captured the
port of Antwerp intact in the first days of September, but it was not operational until 28 November. The estuary of the
Schelde river that controlled access to the port had to be cleared of both German troops and
naval mines. These limitations led to differences between General Eisenhower and
Field Marshal Bernard Montgomery, commander of the Anglo-Canadian
21st Army Group, over whether Montgomery or
Lieutenant General Omar Bradley, commanding the
U.S. 12th Army Group, in the south would get priority access to supplies. German forces
remained in control of several major ports on the
English Channel coast into the autumn, while
Dunkirk remained under siege until the end of the war in May 1945. The Allies' efforts to
destroy the French railway system prior to
D-Day were successful. This destruction hampered the German response to the invasion, but it proved equally hampering to the Allies, as it took time to repair the rail network's tracks and bridges. A trucking system nicknamed the
Red Ball Express brought supplies to front-line troops, but used up five times as much fuel to reach the front line near the Belgian border. By early October, the Allies had suspended major offensives to improve their supply lines and supply availability at the front. Montgomery and Bradley both pressed for priority delivery of supplies to their respective armies so they could continue their individual lines of advance and maintain pressure on the Germans, while Eisenhower preferred a broad-front strategy. He gave some priority to Montgomery's northern forces. This had the short-term goal of opening the urgently needed port of Antwerp and the long-term goal of capturing the
Ruhr area, the biggest industrial area of Germany. With the Allies stalled, German ('Field Marshal')
Gerd von Rundstedt was able to reorganize the disrupted German armies into a coherent defensive force. Field Marshal Montgomery's
Operation Market Garden had achieved only some of its objectives, while its territorial gains left the Allied supply situation stretched further than before. In October, the
First Canadian Army fought the
Battle of the Scheldt, opening the port of Antwerp to shipping. As a result, by the end of October, the supply situation had eased somewhat.
German plans Despite a lull along the front after the Scheldt battles, the German situation remained dire. While operations continued in the autumn, notably the
Lorraine Campaign, the
Battle of Aachen and
fighting in the Hürtgen Forest, the strategic situation in the west had changed little. The Allies were
slowly pushing towards Germany, but no breakthrough was achieved. There were 96 Allied divisions at or near the front, with an estimated ten more divisions on the way from the United Kingdom. Additional Allied airborne units remained in England. The Germans could field a total of 55 understrength divisions.
Adolf Hitler first outlined his planned counter-offensive to his generals on 16 September 1944. The goal was to pierce the thinly held lines of the U.S. First Army between Monschau and Wasserbillig with
Walter Model's
Army Group B by the end of the first day, get the armor through the Ardennes by the end of the second day, reach the
Meuse between
Liège and Dinant by the third day, and seize Antwerp and the western bank of the Scheldt estuary by the fourth day. Hitler initially promised his generals a total of 18 infantry and 12 armored or mechanized divisions "for planning purposes." The plan was to pull 13 infantry divisions, two parachute divisions and six armored divisions from the strategic reserve. On the
Eastern Front, the Soviets'
Operation Bagration during the summer had destroyed much of Germany's
Army Group Center (). By November, it was clear that Soviet forces were preparing for a winter offensive. The Allied air offensive of early 1944 had grounded the
Luftwaffe, leaving the German Army with little battlefield intelligence and no way to interdict Allied supplies. The converse was equally damaging; daytime movement of German forces was rapidly noticed, and attacks on supplies combined with the bombing of the
Romanian oil fields starved Germany of oil and gasoline. This fuel shortage intensified after the Soviets overran those fields in the course of their
Second Jassy–Kishinev Offensive in August 1944. One of the few advantages held by the German forces in November 1944 was that they were no longer defending all of Western Europe. Their front lines in the west had been considerably shortened by the Allied offensive and were much closer to the German heartland. This drastically reduced their supply problems despite Allied control of the air. The extensive telephone and telegraph network meant that radios were no longer necessary for communications, which lessened the effectiveness of Allied
Ultra intercepts. Some 40–50 messages per day were decrypted by Ultra. They recorded the quadrupling of German fighter forces, and a term used in an intercepted Luftwaffe message (, literally, 'Fighter Deployment') implied preparation for an offensive operation. Ultra also picked up communiqués regarding extensive rail and road movements in the region, as well as orders that movements should be made on time.
Drafting the offensive Hitler felt that his mobile reserves allowed him to mount one offensive. Although he realized nothing significant could be accomplished in the Eastern Front, he still believed an offensive against the Western Allies, whom he considered militarily inferior to the Red Army, would have some chances of success. Hitler believed he could split the Allied forces and compel the Americans and British to settle for a separate peace, independent of the Soviet Union. Success in the west would give the Germans time to design and produce more advanced weapons (such as
jet aircraft, new
U-boat designs and
super-heavy tanks) and permit the concentration of forces in the east. After the war ended, this assessment was generally viewed as unrealistic, given Allied air superiority throughout Europe and their ability continually to disrupt German offensive operations. Hitler's plan called for a
Blitzkrieg attack through the weakly defended Ardennes, mirroring the successful German offensive there during the
Battle of France in 1940, and aimed at splitting the armies along the U.S.-British lines and capturing Antwerp. The plan banked on unfavorable weather, including thick fog and low-lying clouds, which would minimize the Allied air advantage. Hitler originally set the offensive for late November, before the anticipated start of the Soviet
Vistula–Oder offensive. The disputes between Montgomery and Bradley were well known, and Hitler hoped he could exploit this disunity. If the attack were to succeed in capturing Antwerp, four armies would be trapped without supplies behind German lines. Several senior German military officers, including Model and von Rundstedt, expressed concern as to whether the goals of the offensive could be realized. Model and von Rundstedt both believed aiming for Antwerp was too ambitious, given Germany's scarce resources in late 1944. At the same time, they felt that maintaining a purely defensive posture (as had been the case since Normandy) would only delay defeat, not avert it. They thus developed alternative, less ambitious plans that did not aim to cross the
Meuse River (in German and Dutch: Maas); Model's being (Operation Autumn Mist) and von Rundstedt's (Plan Martin). The two field marshals combined their plans to present a joint "small solution" to Hitler. When they offered their alternative plans, Hitler would not listen. Rundstedt later testified that while he recognized the merit of Hitler's operational plan, he saw from the very first that "all, absolutely all conditions for the possible success of such an offensive were lacking." Model, commander of German Army Group B (), and von Rundstedt, overall commander of the German
Army Command in the West (), were put in charge of carrying out the operation. The positions of the Allied armies stretched from southern France all the way north to the Netherlands. German planning for the counteroffensive rested on the premise that an attack against thinly manned stretches of the line would halt Allied advances on the Western Front.
Operation names The Wehrmacht's code name for the offensive was ('Operation Watch on the Rhine'), after the German patriotic hymn , a name that deceptively implied the Germans would be adopting a defensive posture along the Western Front. The Germans also referred to it as ('Ardennes Offensive') and Rundstedt-Offensive, both names being generally used nowadays in modern Germany. The French (and Belgian) name for the operation is , 'Battle of the Ardennes'. The battle was militarily defined by the Allies as the Ardennes Counteroffensive, which included the German drive and the American effort to contain and later defeat it. The phrase 'Battle of the Bulge' was coined by contemporary press to describe the way the Allied front line bulged inward on wartime news maps. While the Ardennes Counteroffensive is the correct term in Allied military language, the official Ardennes-Alsace campaign reached beyond the Ardennes battle region, and the most popular description in English speaking countries remains simply 'Battle of the Bulge'.
Planning The OKW decided by mid-September, at Hitler's insistence, that the offensive would be mounted in the Ardennes, as was done in 1940. In 1940 German forces had passed through the Ardennes in three days before engaging the enemy, but the 1944 plan called for battle in the forest itself. The main forces were to advance westward to the Meuse River, then turn northwest for Antwerp and
Brussels. The close terrain of the Ardennes would make rapid movement difficult, though open ground beyond the Meuse offered the prospect of a successful dash to the coast. Four armies were selected for the operation. Adolf Hitler personally selected for the counter-offensive on the northern shoulder of the western front the best troops available and officers he trusted. The lead role in the attack was given to the
6th Panzer Army, commanded by SS
Sepp Dietrich. It included the most experienced formation of the
Waffen-SS: the
1st SS Panzer Division Leibstandarte SS Adolf Hitler. It also contained the
12th SS Panzer Division Hitlerjugend. They were given priority for supply and equipment and assigned the shortest route to the primary objective of the offensive, Antwerp, starting from the northernmost point on the intended battlefront, nearest the important road network hub of
Monschau. The
Fifth Panzer Army under General
Hasso von Manteuffel was assigned to the middle sector with the objective of capturing Brussels. The
Seventh Army, under General
Erich Brandenberger, was assigned to the southernmost sector, near the Luxembourgish city of
Echternach, with the task of protecting the flank. This Army was made up of only four infantry divisions, with no large-scale armored formations to use as a spearhead unit. As a result, they made little progress throughout the battle. In an indirect, secondary role, the
Fifteenth Army, under General
Gustav-Adolf von Zangen, recently brought back up to strength and re-equipped after heavy fighting during Operation Market Garden, was located just north of the Ardennes battlefield and tasked with holding U.S. forces in place, with the possibility of launching its own attack given favorable conditions. For the offensive to be successful, four criteria were deemed critical: the attack had to be a complete surprise; the weather conditions had to be poor to neutralize Allied
air superiority and the damage it could inflict on the German offensive and its supply lines; the progress had to be rapid—the Meuse River, halfway to Antwerp, had to be reached by day 4; and Allied fuel supplies would have to be captured intact along the way because the combined Wehrmacht forces were short on fuel. The General Staff estimated they only had enough fuel to cover one third to one half of the ground to Antwerp in heavy combat conditions. The plan originally called for just under 45 divisions, including a dozen
panzer and divisions forming the
armored spearhead and various infantry units to form a defensive line as the battle unfolded. By this time the German Army suffered from an acute manpower shortage, and the force had been reduced to around 30 divisions. Although it retained most of its armor, there were not enough infantry units because of the defensive needs in the East. These 30 newly rebuilt divisions used some of the last reserves of the German Army. Among them were ('People's Grenadier') units formed from a mix of battle-hardened veterans and recruits formerly regarded as too young, too old or too frail to fight. Training time, equipment and supplies were inadequate during the preparations. German fuel supplies were precarious—those materials and supplies that could not be directly transported by rail had to be horse-drawn to conserve fuel, and the mechanized and panzer divisions would depend heavily on captured fuel. As a result, the start of the offensive was delayed from 27 November until 16 December. Before the offensive the Allies were virtually blind to German troop movement. During the
liberation of France, the extensive network of the
French Resistance had provided valuable intelligence about German dispositions. Once they reached the German border, this source dried up. In France, orders had been relayed within the German army using radio messages enciphered by the
Enigma machine, and these could be picked up and decrypted by Allied code-breakers headquartered at
Bletchley Park, to give the intelligence known as Ultra. In Germany such orders were typically transmitted using telephone and
teleprinter, and a special
radio silence order was imposed on all matters concerning the upcoming offensive. The major crackdown in the Wehrmacht after the
20 July plot to assassinate Hitler resulted in much tighter security and fewer leaks. The foggy autumn weather also prevented Allied reconnaissance aircraft from correctly assessing the ground situation. German units assembling in the area were even issued charcoal instead of wood for cooking fires to cut down on smoke and reduce chances of Allied observers deducing a troop buildup was underway. For these reasons Allied High Command considered the Ardennes a quiet sector, relying on assessments from their intelligence services that the Germans were unable to launch any major offensive operations this late in the war. What little intelligence they had led the Allies to believe precisely what the Germans wanted them to believe-–that preparations were being carried out only for defensive, not offensive, operations. The Allies relied too much on Ultra, not human reconnaissance. In fact, because of the Germans' efforts, the Allies were led to believe that a new defensive army was being formed around
Düsseldorf in the northern Rhineland, possibly to defend against British attack. This was done by increasing the number of
flak (, i.e., anti-aircraft cannons) in the area and the artificial multiplication of radio transmissions in the area. All of this meant that the attack, when it came, completely surprised the Allied forces. Remarkably, the U.S. First Army intelligence chief, U.S. Third Army intelligence chief Colonel
Oscar Koch, and
Supreme Headquarters Allied Expeditionary Force (SHAEF) intelligence officer Brigadier General
Kenneth Strong all correctly predicted the German offensive capability and intention to strike the U.S. VIII Corps area. These predictions were largely dismissed by the U.S. 12th Army Group. Strong had informed
Bedell Smith in December of his suspicions. Bedell Smith sent Strong to warn Lieutenant General Omar Bradley, the commander of the 12th Army Group, of the danger. Bradley's response was succinct: "Let them come." Historian Patrick K. O'Donnell writes that on 8 December 1944 U.S. Rangers at great cost took Hill 400 during the Battle of the Hürtgen Forest. The next day GIs who relieved the Rangers reported a considerable movement of German troops inside the Ardennes in the enemy's rear, but that no one in the chain of command connected the dots. British forces further north were slightly better prepared. Having received decoded signals from
Bletchley Park containing
Luftwaffe instructions not to destroy certain bridges on the
Meuse, Montgomery opted to put on hold a planned northward move from
XXX Corps and instead held in reserve; this would prove significant in the subsequent battle. Despite this however, they too were doubtful of the possibility of a major offensive. Because the Ardennes was considered a quiet sector, considerations of
economy of force led it to be used as a training ground for new units and a rest area for units that had seen hard fighting. The U.S. units deployed in the Ardennes thus were a mixture of inexperienced troops (such as the
99th and
106th "Golden Lions" Divisions), and battle-hardened troops sent to that sector to recuperate (the
28th Infantry Division). Two major
special operations were planned for the offensive. By October it was decided that
Otto Skorzeny, the German SS-commando who
had rescued the former Italian dictator
Benito Mussolini, was to lead a task force of English-speaking German soldiers in
Operation Greif. These soldiers were to be dressed in American and British uniforms and wear
dog tags taken from corpses and prisoners of war. Their job was to go behind American lines and change signposts, misdirect traffic, generally cause disruption and seize bridges across the Meuse River. By late November another ambitious special operation was added: Col.
Friedrich August von der Heydte was to lead a (paratrooper combat group) in
Operation Stösser, a night-time paratroop drop behind the Allied lines aimed at capturing a vital road junction near
Malmedy. German intelligence had set 20 December as the expected date for the start of the
upcoming Soviet offensive, aimed at crushing what was left of German resistance on the Eastern Front and thereby opening the way to Berlin. It was hoped that Soviet leader
Stalin would delay the start of the operation once the German assault in the Ardennes had begun and wait for the outcome before continuing. After the
20 July 1944 attempt to assassinate Hitler, and the close advance of the Red Army which would seize the site on 27 January 1945, Hitler and his staff had been forced to abandon the headquarters in
East Prussia, in which they had coordinated much of the fighting on the Eastern Front. After a brief visit to Berlin, Hitler traveled on his ('Special Train of the Führer') to
Giessen on 11 December, taking up residence in the
Adlerhorst (eyrie) command complex, co-located with OB West's base at Kransberg Castle. Believing in omens and the successes of his early war campaigns that had been planned at Kransberg, Hitler had chosen the site from which he had overseen the successful 1940 campaign against France and the Low Countries. Von Rundstedt set up his operational headquarters near
Limburg, close enough for the generals and Panzer Corps commanders who were to lead the attack to visit Adlerhorst on 11 December, traveling there in an SS-operated bus convoy. With the castle acting as overflow accommodation, the main party was settled into the Adlerhorst's Haus 2 command bunker, including Gen.
Alfred Jodl, Gen.
Wilhelm Keitel, Gen.
Blumentritt, von Manteuffel and Dietrich. In a personal conversation on 13 December between Walter Model and
Friedrich von der Heydte, who was put in charge of Operation Stösser, von der Heydte gave Operation Stösser less than a 10% chance of succeeding. Model told him it was necessary to make the attempt: "It must be done because this offensive is the last chance to conclude the war favorably." Shortly before the start of the offensive, Dietrich and his chief of staff altered the plan. Instead of crossing the Meuse to the west of Liège, Sixth Panzer Army would cross on both sides of the city. If the offensive failed to reach Antwerp, Liège could be captured as a "small solution". Rundstedt and Model tacitly approved, but Jodl and Hitler were not informed. During postwar questioning, Dietrich's story shifted. First he claimed that he issued orders to cross between Liège and Huy. When told that the Americans had captured a map showing pincer movements around Liège, Dietrich said it could have been a Fifteenth Army map. When Dietrich was shown the map, he said that the original plan was to cross on either or both sides of Liège depending on the circumstances. When the northern half of his army's attack bogged down, he changed his order to cross between Liège and Huy, both exclusive. He denied any intention of capturing Liège: it would have been cut off and bypassed. ==Initial German assault==