The bombing of Stuttgart in World War II was a series of 53 air raids that formed part of the strategic air offensive of the Allies against Germany. The first bombing (by 20 aircraft of the Royal Air Force) occurred on August 25, 1940, and resulted in the destruction of 17 buildings. The city was repeatedly attacked over the next four and one-half years by both the RAF and the 8th Air Force as it had significant industrial capacity (including the Daimler and Porsche automotive factories) and several military bases, and was also a center of rail transportation in southwestern Germany. Stuttgart endured 18 large-scale attacks by the Royal Air Force (RAF) during the war (the first and last of which were on 5 March 1942 and 13 February 1945 respectively),^[1] during which 21,016 long tons (21,353 t) of bombs were dropped on the city,^[2] but the RAF concluded that its attacks against Stuttgart were not as effective as they could have been:^[3]

Stuttgart's experience was not as severe as other German cities. Its location, spread out in a series of deep valleys, had consistently frustrated the Pathfinders and the shelters dug into the sides of the surrounding hills had saved many lives.

Even before World War II, in 1916, Stuttgart had been a potential target for air raids because of its short distance from the Western Front of the First World War.^[4] In the next two years, the city would be attacked by Allied aviators on several occasions throughout 1917 and 1918, the Daimler plant in Stuttgart being of special interest to them.^[5][6][7] When the Royal Air Force's Bomber Command began its strategic bombing command during the Second World War, it initially targeted airstrips in Norway and France and U-boat pens in northern France, but soon added civilian targets, such as Stuttgart, to its target list in March 1940.^[8] As early as May of that year, the RAF attempts to bomb targets in Württemberg, of which there were two among the mostly rural region: Stuttgart and Friedrichshafen. Nicknamed the "German Coventry," Stuttgart was an important rail hub and a center of industry, home to the Bosch, Daimler-Benz, and the SKF ball bearings factories. However, actually reaching these targets was difficult because of their great distance from Britain and because of Württemberg's topography of hills and valleys, which befouled the accuracy of British bomb crews. The workaround was to attack in force, starting in 1942–43, but these raids sometimes struck false targets and were costly in life and material.^[9]

On 14 February 1942, the Royal Air Force lifted all constraints from Bomber Command, and Stuttgart was on Bomber Command's list of "Alternative Industrial Areas" with Frankfurt, Schweinfurt, and Kiel.^[10]

On the night of 4–5 May 1942, Stuttgart endured its first large-scale attack, as 121 RAF bombers conducted a strategic bombing of the city to destroy the Bosch factory, which produced components for the Luftwaffe. Extremely dense cloud coverage of the city foiled the raid, and the flotilla's bombs were scattered over the city, though a decoy site at Lauffen am Neckar was hit. Not a single bomb struck the Bosch factory but 13 civilians were killed and 37 more were injured. One Stirling was lost.^[16] The next night, another 77 bombers marshaled against Stuttgart but again were troubled by poor visibility, as the city was obscured by haze. The closest bombs came was the Kräherwald to the west of the city, and three Wellingtons and another Stirling were lost.^[17] Another raid was launched on the night of 6–7 May containing 97 aircraft, but the crews again couldn't identify Stuttgart and instead attacked the Lauffen decoy, which may have led the flotilla to Heilbronn, 20 miles (32 km) away, where seven civilians were killed and more than 150 buildings were destroyed.^[18]

On the night of 22–23 November 1942, 222 bombers made for Stuttgart, but the city was obscured by clouds and the Pathfinders could not identify the city center. The southern districts of the city, namely Rohr, in Vaihingen, Plieningen, and Möhringen were heavily bombed; 88 houses were destroyed and another 334 severely damaged, and 28 people were killed and another 71 injured.^[19] In total, thirty tonnes of bombs had been dropped on the city.^[20]

Several months later on 11 March 1943, a massive fleet of 314 RAF bombers arrived at Stuttgart. Pathfinder units claimed to have spotted the city, but most of the bombs dropped that night fell in open country and on dummy Pathfinder indicators, the first use thereof by the Germans, but still 112 died and 386 were injured when Vaihingen and Kaltental were hit, resulting in the destruction of 118 houses. Six Halifaxes, three Stirlings, and two Lancasters, 3.5% of the total force, were lost during the operation.^[21] The next month, 462 bombers marshaled against Stuttgart and again the Pathfinders claimed to have accurately identified Stuttgart, but the actual bombardment occurred to the northeast of the city. This mission proved a costly failure, as eight Stirlings and Wellingtons, four Halifaxes, and three Lancasters were lost.^[22] That October, the RAF changed gears and sent a force of 343 Lancasters for a nighttime attack with the 101st Squadron equipped with the "Airborne Cigar" jamming device and supplemented with several diversionary flights, all together ensuring that only four Luftwaffe night fighters made their way to Stuttgart by the end of the raid. For a loss of only four Lancasters,^[23] the raid was a massive success, killing 104 civilians and injuring 300 more. A further 31 deaths and 156 injuries were sustained the next month on 26 November 1943,^[24] as a diversionary force of 178 bombers conducted a scattered raid on Stuttgart to draw night fighters away from Berlin for a cost of six Halifaxes lost to the Luftwaffe.^[25]

On the morning of 6 September 1943, 388 B-17 Flying Fortresses gathered over southern England and the English Channel, bound for Stuttgart to destroy its industrial sector, where American intelligence in 1943 estimated 90% of Germany's magnetos and fuel injection nozzles were being produced.^[26] A fifth of this flotilla aborted because of the weather or mechanical failure, leaving the remainder of the formation to carry on into France,^[27] where it began splitting into different diversionary flights to draw away the staffeln from Jagdgeschwader 2.^[28] This was the first daylight attack on Stuttgart, the United States Army Air Force's first attack on Stuttgart, and the eleventh raid on the city.^[11] Of the 262 B-17s that made it to Stuttgart, 45 were lost. Two airmen were killed on the operation while a further 333 went missing in action.^[29]

As the bombers flew over Cambrai, a number of Luftwaffe fighters attacked the formation and exchanged blows with its escorting P-47 Thunderbolts before ceasing their action at 8:44 AM. At this time, the escorting P-47s signaled that they were running low on fuel and had to return to base, meaning that the bombers would be on their own until they returned to current Allied fighter range.^[30] After a short period of calm,^[31] Luftwaffe fighter aircraft of every make and unit (even some Ju 87 Stuka dive bombers) descended upon the force,^[32] inflicting high casualties for some losses.^[33] These attacks abruptly ceased when the bomber flotilla arrived over Stuttgart, where the city's anti-air Flak cannons began to open fire on the bombers.^[34] Unfortunately for the Americans, the Stratus clouds covering the city that day were impossible for the men operating their respective Norden bombsights to spot through,^[35] forcing the various bomber groups, under the command of Brigadier General Robert F. Travis, to circle over the city three times with their bomb bay doors open, slowly using up fuel and being subjected to the German anti-aircraft guns.^[36] Before the fourth run, the 96th and 388th Bomb Groups began leaving to attack the secondary objective of Strasburg, but again failed to spot it and instead deposited their bombs into the Black Forest.^[37] Moments later, Luftwaffe fighters returned to engage the bombers,^[38] and would continue to harry them until they returned to fighter range. 45 bombers were lost during the mission, and the American doctrine of daylight precision bombing would die after the second raid on Schweinfurt later that year.^[39] In Stuttgart, 108 had been killed and 165 injured.^[11]

Out of 21 crews from the 388th crew to embark on the mission, dubbed by the unit as "Black Monday," 13 returned.^[40]

On 3 November 1943, Arthur Harris listed Stuttgart among 19 cities he claimed had been "seriously damaged" in a report of Bomber Command's activities to Prime Minister Winston Churchill.^[41]

In totality, 53 air raids were launched against Stuttgart by the United States Army Air Force and the Royal Air Force. The latter conducted carpet bombing of civilian targets in Stuttgart according to the Area bombing directive of 14 February 1942.^[58] 4562 German citizens were killed,^{[59][lower-alpha 1]} as were 770 foreigners, most of whom were forced laborers. An estimated 300 aircraft and 2400 Allied personnel were lost.^{[citation needed]} 68% of Stuttgart's center was destroyed.^[60]

A total of 27,000 tons of bombs fell on Stuttgart; 20,000 high explosive bombs and 1.3 million incendiary devices.^[61] An estimated 12000 bombs remain undetonated in the city limits. On 4 June 2014, a residential area near Degerloch and Sillenbuch, was evacuated so that police could disarm two 250 kg (550 lb) bombs.^[59]

The 15,000,000 cubic meters (530,000,000 cu ft) cubic meters of rubble leftover from the war was gathered on the Birkenkopf from 1953 to 1957 to form a Schuttberg.^[62] On 9 August 2018, a monument to two teenage Flakhelfer was unveiled at the cemetery in Degerloch, a municipality of Stuttgart.^[63]

Canadian painter Carl Schaefer, then a member of the Royal Canadian Air Force as a war artist, depicted No. 6 Squadron RAF as it prepared to leave to bomb Stuttgart on 7 October 1943. Schaefer used the date in the watercolor painting Marshalling Lancasters Against Stuttgart, 7 October 1943, though he most likely finished the piece later. This piece would become one of five of his works to be put on public exhibition.^[64]