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| Adlertag | |
|---|---|
| Name | Operation Adlertag |
| Partof | Channel Front, Western Front (World War II) |
| Date | 13 August 1940 |
| Place | United Kingdom airspace, English Channel |
| Result | German tactical successes; strategic failure |
| Combatant1 | Luftwaffe |
| Combatant2 | Royal Air Force |
| Commander1 | Hermann Göring |
| Commander2 | Hugh Dowding |
| Strength1 | Approximately 1,200 aircraft |
| Strength2 | Approximately 640 fighters, 1,700 anti-aircraft guns |
Adlertag was the opening day of a major Luftwaffe offensive against the Royal Air Force during the Battle of Britain in 1940. Conceived as a concentrated series of raids to destroy the RAF Fighter Command infrastructure, airfields, and aircraft, it marked a shift from maritime interdiction to sustained aerial assault over Southern England. Although German formations achieved local tactical successes, strategic resilience by British forces and intelligence, combined with operational miscalculations, prevented the collapse of RAF Fighter Command.
In mid-1940, following the fall of France, Adolf Hitler and Hermann Göring authorized an air campaign to gain air superiority prior to a planned invasion, Operation Sea Lion. The Luftwaffe High Command, influenced by doctrine from the Spanish Civil War and officers like Albert Kesselring and Hugo Sperrle, prioritized destroying RAF Fighter Command infrastructure, including radar stations at Chain Home sites, Biggin Hill, and Kenley. German planning drew on precedents from the Blitzkrieg on the Western Front (World War II) and the interdiction concepts developed during the Battle of France. Strategic coordination involved the OKL staff in Berlin and tactical commands such as Luftflotte 2 and Luftflotte 3, with support from bomber units including Kampfgeschwader 26 and fighter units like Jagdgeschwader 51.
British preparations were shaped by innovations in integrated air defence, notably the Dowding System administered by Hugh Dowding and implemented by commanders like Keith Park and Trenchard, using RAF Fighter Command sectors, Royal Observer Corps, and Anti-Aircraft Command resources. Intelligence from Bletchley Park and reconnaissance by units such as No. 11 Group RAF informed dispositions. Political oversight came from leaders including Winston Churchill and the War Cabinet.
The German order of battle assembled aircraft from several Geschwader: fighter units Jagdgeschwader 51, Jagdgeschwader 52, and bomber formations Kampfgeschwader 53 and Kampfgeschwader 76, employing types like the Messerschmitt Bf 109, Messerschmitt Bf 110, Heinkel He 111, Dornier Do 17, and Junkers Ju 88. Support elements included reconnaissance units and anti-shipping assets from Fliegerkorps formations.
Opposing them, RAF Fighter Command deployed squadrons of Supermarine Spitfire and Hawker Hurricane fighters within groups such as No. 11 Group RAF and No. 12 Group RAF, supported by night-fighter assets, Royal Observer Corps spotters, and ground defences manned by the Territorial Army under Anti-Aircraft Command. Air-sea rescue and Royal Navy units provided limited support over the English Channel. Aircraft production and reserve pools at factories like Vickers-Armstrongs and Hawker Aircraft contributed replacement fighters and pilots.
On 13 August 1940, the operation commenced with coordinated raids targeting RAF airfields and Chain Home radar installations across Southeast England. Morning fighter sweeps by Jagdgeschwader 51 and Jagdgeschwader 52 engaged No. 11 Group RAF patrols near Dover, while bomber streams of Kampfgeschwader 76 and Kampfgeschwader 53 struck Biggin Hill, Croydon Airport, and Kenley. Encountering layered defence from the Dowding System, Hawker Hurricane and Supermarine Spitfire squadrons vectored by sector controllers in Uxbridge intercepted formations over Sussex and the Thames Estuary.
Tactical actions produced several intense dogfights involving aces and unit commanders from both sides, including engagements reminiscent of earlier clashes in the Battle of France. Luftwaffe fighter escorts suffered fuel and range constraints related to the Bf 109's limited endurance, forcing some bomber formations to proceed with reduced protection. Anti-aircraft batteries around London and along the coast engaged medium and high level bombers, complicating bombing accuracy. By late afternoon, German units had inflicted damage on multiple airfields but withdrew due to mounting losses and the persistent interception by RAF squadrons. Night raids and follow-up operations continued in the subsequent weeks, shifting German tactics toward attacks on civilian targets seen in later The Blitz phases.
The raids on the opening day caused destruction to runways, hangars, and ancillary facilities at air stations including Biggin Hill and Croydon Airport, damaging aircraft and infrastructure. RAF losses included a number of Hawker Hurricane and Supermarine Spitfire airframes destroyed or damaged, while Luftwaffe losses comprised fighters and bombers such as Heinkel He 111 and Dornier Do 17 crews. Civilian areas around Croydon and London sustained collateral damage due to inaccurate bombing and secondary fires.
Material impact extended beyond immediate airframe attrition: repair and dispersal measures—such as camouflage, dummy airfields, and industry moves to factories like Vickers-Armstrongs and de Havilland—mitigated longer-term effects. Pilot casualties affected experienced cadre in squadrons drawn from units like No. 303 Squadron RAF and others formed from expatriate personnel from Poland and Czechoslovakia, but replacement training at RAF College Cranwell and operational conversion units helped sustain sorties.
Although the day achieved temporary tactical advantages for the Luftwaffe, the failure to destroy RAF Fighter Command decisively allowed British resistance to continue. The resilience of the Dowding System, political resolve from Winston Churchill, and industrial responses by manufacturers such as Supermarine and Hawker preserved British air capability. Strategically, the operation reinforced the limits of German air power projection over Southern England and exposed flaws in planning for Operation Sea Lion.
The escalation into extensive bombing campaigns—ultimately culminating in The Blitz—reflected a German strategic pivot when air superiority remained elusive. Air warfare lessons from the operation influenced subsequent doctrines in the Luftwaffe and RAF, shaped post-war analyses by historians of the Second World War, and entered the strategic studies literature alongside accounts of campaigns like the Battle of the Atlantic and the Eastern Front (World War II). Category:Battle of Britain