The claim that the attack on London was retaliation for starting an air war against civilians with the raid on Berlin on the night of 25/26 August is equally hollow. The Berlin raid was very small-scale, and the amount of damage inflicted on the capital itself negligible. The psychological impact was much greater on a population lulled into complacency by months of propaganda on the invulnerability of the city. ‘The Berliners are stunned,’ wrote William Shirer in his diary, ‘from all reports there was a pell-mell, frightened rush to the cellars…’38 On 29 August British bombers returned, this time killing ten Berliners (including four men and two women watching the pyrotechnic battle from a doorway). Goebbels made the most of a golden opportunity. ‘Berlin is now in the theatre of war,’ he confided to his diary. ‘It is good that this is so.’ The Berlin papers played up the air terror and the genocidal intention ‘ “to massacre the population of Berlin” ’. 39
The raids on Berlin were in reality retaliation for the persistent bombing of British conurbations and the high level of British civilian casualties that resulted. In July 258 civilians had been killed, in August 1,075; the figures included 136 children and 392 women.40 During the last half of August, as German bombers moved progressively further inland, bombs began to fall on the outskirts of London. On the night of 18/19 August bombs fell on Croydon, Wimbledon and the Maidens. On the night of 22/23 August the first bombs fell on central London in attacks described by observers as ‘extensive’ and for which no warning was given; on the night of 24/25 August bombs fell in Slough, Richmond Park and Dulwich. On the night the RAF first raided Berlin, bombs fell on Banstead, Croydon, Lewisham, Uxbridge, Harrow and Hayes. On the night of the next raid on Berlin, on 28/29 August, German aircraft bombed the following London areas: Finchley, St Pancras, Wembley, Wood Green, Southgate, Crayford, Old Kent Road, Mill Hill, Ilford, Hendon, Chigwell. London was under ‘red’ warning for seven hours and five minutes.41 The bombing of London began almost two weeks before Hitler’s speech on 4 September, and well before the first raid on Berlin.
The switch to attacks on London forced Fighter Command and the German Air Force to rethink the battle. The main weight of German bombing slowly gravitated towards night attack, which produced much lower bomber losses. Daylight operations against the capital, which began in force on 7 September, when 350 bombers raided the east London dock area, required German fighters to fly to the very limit of their range. Bomber crews insisted that they be given an adequate defensive shield to try to reduce the heavy losses of the previous three weeks. Goering ordered fighters to fly not only in front and above the bombers, but now to weave in and out of the bomber stream itself. Because bombers were so much slower at the higher altitudes chosen for the London attacks, fighters were forced to fly a zig-zag course to keep in contact, which used up precious supplies of fuel and reduced their radius of action even more.
Fighter Command reacted to the changed battlefield almost at once. The bombers attacked London in three waves. Park ordered 11 Group to put up six squadrons held at ‘readiness’ for the first wave of bombers; a further eight squadrons were held back to meet the second wave; the remaining squadrons were detailed to attack the third wave, or to provide protection for airfields and factories in the bombers’ path. Aircraft from 10 and 12 Groups protected 11 Group’s own airfields. The higher altitude flown by the attacker added new difficulties. Radar had problems estimating the greater heights precisely; fighters had to climb further and could seldom get above the incoming aircraft, where attack was most advantageous. The problem was tackled by withdrawing from the coastal stations, to give fighters more time to assemble. When fighters were ascending, they gave false height references over the radio to bring German fighters to altitudes below them. Finally, on 21 September Park instituted standing patrols, with Spitfires flying high to engage fighters and with Hurricanes at bomber altitude.42 The chief result of these changes was to reduce Fighter Command’s loss rate and to impose escalating destruction on an already overstretched bomber force. In the first week of attacks on London, the German bomber arm lost 199 aircraft.
Over the period from 7 September to 5 October, when daylight bombing raids petered out, there were 35 major attacks, 18 of them on London. It was during this phase of the battle that the so-called ‘Big Wing’ controversy emerged. ‘Big Wings’ or ‘Balbos’ (after the flamboyant Italian airman Italo Balbo) were inspired by one of the legends of the battle, Wing Commander Douglas Bader. Flying with 12 Group, he developed the idea that fighters should fly in large formations in order to hit the approaching air fleet with maximum striking power. His commander, Air Vice-Marshal Leigh-Mallory, supported the innovation, but Park was strongly opposed on the grounds that concentration of fighter forces would simply let the successive waves of bombers fly on unimpeded while fighters sat on the ground rearming. What separated the two Groups were facts of geography. Park had to fight incoming waves of bombers with strong fighter escort; Leigh-Mallory’s fighters met bomber forces further inland, with weaker fighter defences and their position clearly known. Under these circumstances the concentration of fighter forces made greater operational sense. Nevertheless, as Park took pleasure in reminding Dowding, 12 Group aircraft could engage the enemy in ‘Big Wings’ only seldom. In September, Bader’s Duxford-based squadrons flew in large formations only five times; in the second half of October they managed only ten sorties and shot down just one enemy aeroplane. In Park’s judgement the use of ‘Big Wings’ would have ‘lost the Battle of London’.43
The air battles in the week between 7 September and 15 September were decisive in turning the tide of the battle. During that week the German Air Force lost 298 aircraft; Fighter Command lost 120, against 99 enemy fighters. The greatest damage was inflicted on the German attack on 15 September, which has been celebrated since the war as Battle of Britain Day. A force of more than 200 German bombers, heavily escorted by fighters, attacked by day in the conventional three waves. They were met by more than 300 Spitfires and Hurricanes. A total of 158 bombers reached London, but visibility was poor and the bombs were widely scattered. The returning bombers were harried by fighters as far as the Channel. It was officially announced that night that 185 of the enemy had been destroyed. In fact during the course of the day 34 German bombers had been destroyed, 20 more extensively damaged and 26 fighters shot down. Of the original force of 200 bombers the loss rate was 25 per cent.44 These were rates that no air force could sustain for more than a few days; they were very much greater than the worst loss rates experienced by Allied bombers over Germany in the air battles of 1943 and 1944. This was the last great daylight raid. On 18 September some 70 bombers attacked London with heavy losses. After that the attacks switched to night-time.