Battle of Britain
Winston Churchill spoke to the House of Commons on the 18th of June, 1940. He declared that the Battle of France was over and that the Battle of Britain was about to begin. This speech gave the campaign its name before a single shot had been fired in anger. The German high command recognized that a seaborne attack would be difficult while the Royal Navy controlled the English Channel. Hitler ordered preparations for Operation Sea Lion on the 16th of July, 1940. This plan required air superiority as a precondition for any amphibious assault. The Luftwaffe received orders on the 1st of August to achieve this goal by incapacitating RAF Fighter Command. Twelve days later, attacks shifted directly against British airfields and infrastructure. The primary objective remained compelling Britain to agree to a negotiated peace settlement. Germany failed to destroy these defenses or force an exit from the conflict. This failure marked the first major defeat for Nazi Germany in the Second World War.
The Messerschmitt Bf 109E fighter outclimbed the Hurricane Mk I and flew up to 40 mph faster at certain altitudes. British squadrons converted to 100 octane fuel by mid-1940, gaining approximately 30 mph in speed. The Spitfire Mk I proved superior to expectations during the Dunkirk evacuation. German pilots retained a strong belief that their machine was the better fighter despite performance data. The Bf 109 carried two 20mm cannons and two 7.92mm machine guns. British fighters relied on eight Browning .303 machine guns firing standard bullets. Damaged German bombers sometimes returned home with over two hundred hits from these smaller rounds. The DB 601 engine used fuel injection, allowing vertical-plane negative-g maneuvers without cutting out. Carburettor-equipped Merlin engines could not perform this trick as readily. The twin-engined Bf 110C lacked maneuverability and acceleration, making it a failure as a long-range escort. It suffered heavy losses on 13 and the 15th of August, equivalent to an entire Gruppe. The Heinkel He 111 bomber carried the largest internal bomb load among its peers.
Chain Home radars provided early detection of incoming raids along the southern coast. Reports flowed from observation posts directly to Fighter Command Headquarters at Bentley Priory. Operators filtered multiple reports into single tracks before forwarding them to Group headquarters. Sector stations then controlled anti-aircraft batteries within their specific area. An army officer sat beside each fighter controller to direct gun crews when to fire. This system maintained an average interception rate of over 75% during the battle. Early war missions had only a 30% chance of ever seeing their target. Some interceptions achieved 100% success rates where every dispatched fighter found its target. Luftwaffe fighters attempting to intercept raids often returned home having never seen enemy aircraft. The British radar network remained a well-kept secret until intelligence gathered before the war revealed its existence. Even good information was ignored if it did not match conventional preconceptions held by German commanders. The system allowed squadrons to attack particular targets with precision rather than random searching.
Abteilung V produced a report on the 16th of July, 1940 that lacked information on RAF radar capabilities. Oberstleutnant Beppo Schmid led this intelligence unit which assessed Fighter Command strengths incorrectly. The report assumed the British system was rigid and inflexible with fighters tied to home bases. An optimistic conclusion stated that the RAF would run out of frontline fighters quickly. This mindset persisted despite evidence to the contrary from aerial reconnaissance. Many times leadership believed strength had collapsed only to discover formations could be sent up at will. The Luftwaffe operated blind for much of the campaign due to poor intelligence gathering. Reconnaissance aircraft like Dornier Do 17s proved easy prey for British fighters without escort. Raids against supposed fighter airfields frequently fell instead on bomber or coastal defense stations. Results were consistently exaggerated due to inaccurate claims and over-enthusiastic reporting. There was never a systematic focus on one type of target such as airbases or factories. The lack of solid intelligence meant Germans did not adopt a consistent strategy throughout the fighting.
Fifty-nine non-British pilots flew at least one authorized operational sortie between the 10th of July and the 31st of October, 1940. One hundred forty-five Poles served in the Royal Air Force during the conflict. No. 303 Polish Fighter Squadron became the highest-scoring unit even though it joined two months late. Fourteen thousand five hundred aircrew died in total across all commands during the battle. Forty-seven New Zealanders lost their lives including fifteen fighter pilots and twenty-four bomber crew members. Names of these Allied airmen are inscribed in a memorial book resting in Westminster Abbey. A stained glass window contains badges of squadrons and flags of nations represented. About 20% of all pilots who took part came from non-British countries. Some had fled their home countries because of German invasions before arriving in Britain. Air Chief Marshal Hugh Dowding stated that without Polish contributions the outcome might have been different. The Italian Air Corps also participated later in the campaign starting on the 24th of October, 1940.
German Rotte formations allowed leaders to concentrate shooting while wingmen covered blind spots. Two Rotten combined into a Schwarm where all pilots watched surrounding activity closely. RAF fighters initially flew tight v-shaped sections called vics with four aircraft per section. Only the squadron leader at the front could watch for enemies while others kept station. German pilots dubbed these rigid formations Idiotenreihen due to their vulnerability. Squadron Leader Adolph Sailor Malan adopted fours in line astern which proved vastly superior. Heinkel He 59 floatplanes picked up downed aircrew from the North Sea and English Channel. Seenotdienst units carried life rafts and fluorescein sachets creating bright green patches upon water contact. Churchill issued an order on the 13th of July stating these rescue planes would be shot down from the 20th of July onwards. White He 59s were repainted in camouflage colors and armed with defensive machine guns. Big Wings tactics proposed by Douglas Bader involved forming groups of three squadrons to attack en masse. Proponents claimed large numbers caused greater enemy losses while reducing own casualties. Opponents argued formation took too long and risked catching fighters refueling on the ground.
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Common questions
When did Winston Churchill declare the Battle of Britain was about to begin?
Winston Churchill declared that the Battle of Britain was about to begin on the 18th of June, 1940. This speech gave the campaign its name before a single shot had been fired in anger.
What were the main differences between German and British fighter aircraft engines during the battle?
The DB 601 engine used fuel injection allowing vertical-plane negative-g maneuvers without cutting out while carburettor-equipped Merlin engines could not perform this trick as readily. The Messerschmitt Bf 109E flew up to 40 mph faster at certain altitudes but British squadrons gained approximately 30 mph by converting to 100 octane fuel by mid-1940.
How effective was the Chain Home radar system for intercepting Luftwaffe raids?
This system maintained an average interception rate of over 75% during the battle compared to early war missions having only a 30% chance of ever seeing their target. Reports flowed from observation posts directly to Fighter Command Headquarters at Bentley Priory where operators filtered multiple reports into single tracks before forwarding them to Group headquarters.
Why did German intelligence fail to accurately assess RAF capabilities in July 1940?
Abteilung V produced a report on the 16th of July, 1940 that lacked information on RAF radar capabilities and assumed the British system was rigid and inflexible with fighters tied to home bases. Oberstleutnant Beppo Schmid led this intelligence unit which assessed Fighter Command strengths incorrectly leading to an optimistic conclusion that the RAF would run out of frontline fighters quickly.
Which non-British squadron achieved the highest score during the Battle of Britain?
No. 303 Polish Fighter Squadron became the highest-scoring unit even though it joined two months late. One hundred forty-five Poles served in the Royal Air Force during the conflict while about 20% of all pilots who took part came from non-British countries.