The Battle of Britain
The Battle of Britain started officially on 10 June 1940, when the Luftwaffe attacked a convoy of ships off Dover. But the real air war started on 12 August (when the Luftwaffe attacked the RAF), and lasted until 31 October.
At first the Luftwaffe attacked radar stations and airfields. Although the Luftwaffe lost more planes than the RAF, by the 31 August the RAF was at its last gasp – in the previous fortnight the RAF had lost 295 planes destroyed and 170 damaged, 103 pilots killed and 128 wounded. Flying five or more ‘sorties’ a day, the young British fighter pilots (nicknamed ‘Dowding’s chicks’) were becoming exhausted; more importantly, the RAF was not training new pilots as fast the pilots were being killed. The weekend 30-31 August was the worst weekend of the battle for the RAF, with 65 fighters destroyed and 6 of the seven sector stations in the vital south-east Group out of action.
Just as Fighter Command was about to collapse, however, a miracle happened. On 24 August, by accident, some Luftwaffe bombers had dropped their bombs on London. The next few nights, the RAF replied by bombing Berlin. Hitler was angry. On 2 September he ordered his bombers to attack London. On 7 September the Nazi bombing raid was so huge that a false alarm went round the south-east of England: code-word ‘Cromwell’ – invasion imminent. Church bells rang and the Home Guard mobilised. It was not known at the time but one section of coast identified by the Nazis as a landing ground was defended by a Home Guard platoon with just one machine-gun!
Hitler’s decision to stop attacking the RAF gave it time to recover. On 15 September, the Luftwaffe came by day in huge numbers. It expected to sweep the RAF from the skies. But the RAF fought them off. At one point every British plane was in the sky – soon, some would have to come in to refuel and there were no reserves to protect them. But the Luftwaffe, too, was at the limit and – just in time – it turned back.
http://www.johndclare.net/wwii6.htm
The battle begins
The battle began in mid-July and, initially, the Luftwaffe concentrated on attacking shipping in the English Channel and attacking coastal towns and defences. From 12 August, Goering shifted his focus to the destruction of the RAF, attacking airfields and radar bases. Convinced that Fighter Command was now close to defeat, he also tried to force air battles between fighter planes to definitively break British strength.
However, Goering grew frustrated by the large number of British planes that were still fighting off his attacks. On 4 September, the Luftwaffe switched tactics again and, on Hitler's orders, set about destroying London and other major cities.
Eleven days later, on what became known as 'Battle of Britain Day', the RAF savaged the huge incoming Luftwaffe formations in the skies above London and the south coast.
http://www.bbc.co.uk/history/battle_of_britain