Big Week

Background

Prior to the Big Week, throughout 1943, the U.S. 8th Air Force had been growing in size and experience and started pressing attacks deeper into Germany. It was believed that the defensive firepower of the B-17 and B-24 bombers, typically ten .50 caliber machine guns or more per aircraft, would allow them to defend themselves as long as they remained arranged into tight formations, allowing for overlapping fire. In practice this proved less successful; although the bombers did claim a fair number of German fighters, losses among the bombers were unsustainable.

The Schweinfurt-Regensburg missions are a famous example. On August 17, 1943, 230 bombers launched a mission against the ball bearing factories in Schweinfurt and another 146 against the aircraft factories in Regensburg. Of this force, 60 aircraft were lost before returning to base and another 87 had to be scrapped due to irreparable damage. The Germans claimed 27 fighters lost, serious enough but paling in comparison to the losses on the part of the US forces. The Second Raid on Schweinfurt on October 14, 1943, remembered as "Black Thursday", was even more bloody; of the 291 aircraft on the mission, 60 were lost outright, with a further 17 damaged beyond repair. Daylight missions into Germany were called off in order to rebuild the forces.

The raids were extensively studied by both forces. The Germans concluded that their tactic of deploying twin-engine heavy fighter designs, with heavy armament to make them usable as bomber destroyers and serving primarily with the Zerstörergeschwader combat wings, was working well. Over the winter of 1943–44 they continued this program, adding to their heavy fighter ranks and developing heavier armaments for all of their aircraft. They also pulled almost all of their fighter forces back into Germany, as the majority of their losses were due to fighter actions over forward areas. There seemed to be no point in trying to attack the bombers with enemy fighters in the area. The Allied forces came to other conclusions. Schweinfurt demonstrated that the bombers were not able to protect themselves, contrary to earlier thinking, and fighter cover had to be extended over the entire mission. Luckily for the U.S., the P-51 Mustang, an aircraft that had the range to escort the bombers to targets deep within Germany, was starting to arrive in quantity. Over the winter they re-equipped their fighter squadrons as Mustangs arrived and longer-range versions of existing fighters were developed.

By the early spring of 1944, both forces had laid their plans and were waiting to put them into action. The U.S., expecting a fighter advantage, planned missions that would demand a German response. They decided to make massive raids on the German fighter factories; if the Germans chose not to respond they would be at risk of losing the air war without firing a shot, if they did respond, they would meet fighters in the process. The Germans needed no provocation, they were ready to meet a raid with their new forces. By up-gunning their fighters they reduced their performance, making them easy targets for the new and unexpected Mustangs.

Operations

The Americans flew continuously escorted missions against airframe manufacturing and assembly plants and other targets in numerous German cities including: Leipzig, Brunswick, Gotha, Regensburg, Schweinfurt, Augsburg, Stuttgart and Steyr. In six days, the Eighth Air Force bombers based in England flew more than 3,000 sorties and the Fifteenth Air Force based in Italy more than 500. Together they dropped roughly 10,000 tons of bombs.

During Big Week, the Eighth Air Force lost 97 B-17s, 40 B-24s and another 20 scrapped due to damage. The Fifteenth Air Force lost 90 aircraft and American fighter losses stood at 28. Although these numbers are high in absolute terms, the numbers of bombers involved in the missions were much higher than previously, and the losses represented a much smaller percentage of the attacking force. The earlier Schweinfurt missions had cost the force nearly 30 percent of their aircraft per mission; for the Big Week it was under 7 percent.

U.S. aircrews claimed more than 500 German fighters destroyed, though the numbers were massively exaggerated. The Luftwaffe losses were high amongst their twin-engined Zerstörer units, and the Bf 110 and Me 410 groups were severely depleted. More worrying for the Jagdwaffe was the loss of 17 percent of its pilots, nearly 100 of them being killed. In contrast to the raids of the previous year, the US losses were replaceable, while the Germans were already hard pressed due to the war in the East. Although not fatal, Big Week was an extremely worrying development for the Germans.

The actual damage to the German aircraft industry was fairly limited; during 1944 German aircraft industry was to reach its fighter production peak by reducing the production of other aircraft types and ruthlessly exploiting the workforce, comparable with the U.S and Soviet industries. The lack of skilled pilots due to an attrition in the three-front war was the factor eroding the capability of the Jagdwaffe. The Luftwaffe had to abandon its tactic of "maximum defensive effort" to daylight bombing missions in favor of hit-and-run intercepts. While the Jagdwaffe remained formidable, air superiority had passed irrevocably to the Allies.

Aftermath

The Big Week raids demonstrated that the Luftwaffe's best anti-bomber weapon, twin-engine Zerstörer designs like the Me 410 Hornisse, were appallingly vulnerable against Allied fighters. They were removed from service in the west, passing the defense role primarily to the higher performance single-engine designs.

Due to the protection offered by Allied long-range fighters, a change of tactics was introduced: German fighters formed up well in front of the bombers, took a single head-on pass through the stream and then departed. This gave the defending fighters little time to react and a few shells into the cockpit could "destroy" a bomber in one pass. In a repeat of earlier RAF strategy, the Luftwaffe also attempted to form up their own version of the "Big Wing", which they hoped would allow them to bring the twins back into combat in the safety of a huge number of escorting single-engined fighters. As had sometimes been the British experience, these formations proved extremely difficult to arrange.

Big Week bolstered the confidence of U.S. strategic bombing crews. Until that time, Allied bombers avoided contact with the Luftwaffe; now, the Americans used any method that would force the Luftwaffe into combat. Implementing this policy, the United States looked toward Berlin. Raiding the German capital, Allied leaders reasoned, would force the Luftwaffe to battle. On March 4, the USSTAF launched the first of several attacks against Berlin. A force of 730 bombers set off from England with an escort of 800 fighters. Fierce battles raged and resulted in heavy losses for both sides; 69 B-17s were lost but it cost the Luftwaffe 160 aircraft. The Allies replaced their losses; the Luftwaffe could not.

The new German tactic of using Sturmböcke (heavily armed Fw 190s) as bomber destroyers, and Bf 109Gs to escort them in Gefechtsverband formations, were proving somewhat effective. The U.S. fighters, kept in close contact with the bombers they were protecting, could not chase the attacking fighters before they were forced to turn around and return to the bombers. Lt. Gen. Jimmy Doolittle, commander of the 8th Air Force from the end of 1943, responded by initiating a breakthrough in fighter tactics by "freeing" the fighters, allowing them to fly far ahead of the heavy bomber formations in an air supremacy "fighter sweep" mode on the outward legs, then roam far from the bomber streams and hunt down the German fighters—especially the Sturmböcke, that had limited manoeuvrability with their heavy wing-mount autocannons—before they could approach the bombers. Though the change was unpopular with the bomber crews, its effects were immediate and extremely effective.

The Combined Bomber Offensive attacks against fighter production officially ended on April 1, 1944 and control of the air forces passed to U.S. General Dwight D. Eisenhower in preparation for the invasion of France. Allied airmen were well on the way to achieving air superiority over all of Europe. "While they continued strategic bombing, the USAAF turned its attention to the tactical air battle in support of the Normandy invasion".

RAF bomber sorties during Big Week

Bomber Command directly contributed to the attacks on the aircraft industry in Schweinfurt. Some 734 bombers were dispatched on the night of 24/25 February, and 695 struck the target. Of the bombs dropped, 298 hit within three miles and 22 hit inside the target area. Little damage was done. On 25/26 February 1944, Bomber Command sent 600 bombers to the aircraft assembly plant at Augsburg. The attack was accurate and they destroyed some 60 percent of the industrial city.