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No. 421 (Reconnaissance) Flight RAF
No. 421 (Reconnaissance) Flight was a specialist RAF fighter flight created on 21 September 1940 to patrol the Channel and provide early warning of the types of incoming Luftwaffe raids from occupied France. It was later expanded to full squadron strength and renumbered as No. 91 Squadron on 11 January 1941. Its role led to its pilots being nicknamed "Jim Crows".
== Background ==
In late September 1940, Air Chief Marshal Hugh Dowding was faced with two problems. The first was a change in Luftwaffe tactics. Until then the main daylight striking force had been the German bombers, heavily escorted by fighters. With the shift in phases in the Battle of Britain, the bombers had concentrated first on Channel convoys, then the 11 Group airfields, and finally London. Göring's aim had been to wear down the RAF fighters, but instead he saw an unacceptable level of his bombers lost. Whilst fighter-bombers, known to the Luftwaffe as Jabos, had been tried by Luftwaffe units such as Erprobungsgruppe 210 during the Battle, these had mainly been small and low-altitude efforts. Now the bombers switched mainly to night attacks, and the day operations more often consisted of high-flying Bf109 sweeps and large numbers of Bf109 Jabos with escorts. This was intended both to force the RAF fighters to engage the Luftwaffe fighters and also keep the pressure on the RAF. The Jabos could always jettison their bombs and revert to being fighters if intercepted. The Jabos were not much of a tactical threat in that - apart from specialists like Erpro.210 - they were highly inaccurate when dropping their bombs, but against area targets such as London they could still cause significant damage and civilian deaths. It was impossible for the Fighter Command Controllers to identify which incoming raids were fighter sweeps (which posed no threat to Britain and were to be avoided), which were the escorted Jabo raids, and which were escorted bombers, the last two requiring different tactics to minimise RAF losses and maximise those of the Luftwaffe.
Dowding's second problem was how to hide the information the RAF was gleaning from Ultra, the information from interception of German transmissions encoded with the Enigma machine. Ultra had given the RAF advance warning of some major Luftwaffe raids, and the general radio interceptions from the Y-stations had also provided clues. It was also providing information on German shipping in the Channel. Dowding did not want the Germans becoming suspicious of how well prepared the British were getting.
Dowding's solution was to create a special unit of experienced pilots to patrol the Channel during daylight hours, alone or in pairs, identifying which incoming raids were Jabos and which were fighter sweeps, and also provide information on German naval activity. The activities of this unit would also provide for the Germans a believable source for the RAF's preparedness, protecting Ultra. This unit was called No. 421 Flight.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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