Breaking the Enigma code
Polish contribution to victory

Andrzej Dabrowa, Ph.D.

Enigma machine M Rajewski H Zygalski J. Rozycki
Chapters
  1. Synopsis
  2. Historical background
  3. Breaking the Enigma Code
  4. Polish decrypting effort 1930-1939
  5. Polish decrypting effort 1939-1945
  6. English decrypting effort - the beginnings
  7. England - Bletchley Park
  8. United States in the secret war
  9. 9. Battle of Britain
  10. British northeast Africa
  11. Invasion of French northwest Africa
  12. Battle of the Atlantic
  13. Battle of the terror weapons V1 & V2
  14. German atrocities
  15. Enigma security
  16. Conclusion
  17. Epilogue
  18. Glossary and abbreviations
  19. References

9. Battle of Britain

Germany did not start bombing targets in Britain until July 1940, which gave Britain sufficient time to build up their defence systems. These were the Early Warning Radar, a network of aircraft spotters, a large telephone network, dispersed airfields, fuel and ammunition delivery and storage dumps, and (of course) the Fighter Command Centre where all the information was delivered and all decisions were made.

From the very beginning of the war the Royal Air Force accepted foreign pilots to supplement the dwindling pool of British pilots. On the 11th of June 1940 the Polish Government in Exile signed an agreement with the British Government to form a Polish Army in Britain and, specifically, a Polish Air Force. The first two (of ten) Polish fighter squadrons went into action in August 1940. A total of 89 Polish pilots defended the British sky. A squadron, named after the Polish-American hero General Tadeusz Kosciuszko, achieved the highest number of kills (273) of all the fighter squadrons engaged in the Battle of Britain.

July 10th is considered to have been the official start of the Battle of Britain when the Germans started massive bombing of British cities. This all out attack was in preparation for "Operation Sea Lion", the invasion of Britain, by gaining absolute air superiority. Reichsmarschall Hermann Goering pitted 1700 bombers and 1100 fighters against 600 British fighters in the hope of achieving that goal. This imbalance of forces was compensated by the Enigma intercepted German orders provided daily by Bletchley Park. By this time there was a secure teleprinter line from Bletchley Park to Air Marshal H. Dowding's Fighter Command Centre at Stanmore. A steady daily traffic of more than 200 messages gave Dowding hour by hour detailed knowledge of German advance plans as well as last moment changes. This gave him a more than even chance to make the most efficient use of his very limited resources and to avoid over commitment and risk of defeat by the overwhelming German Air Force.

The actual order to start massive bombing given by Reichsmarschall Goering was intercepted, decrypted and immediately passed to Dowding and Churchill. It read: " Within a short period of time you will wipe the British Air Force from the sky. Heil Hitler" but bad weather delayed the German attack for several days. In the first wave the Germans made 1,786 sorties against airfields and defence positions, losing 75 aircraft. As the intensity of bombing was continuously increasing, Fighter Command was able to engage the enemy in the most effective way. Dowding's methods were highly criticised by his subordinates, who did not have access to Ultra information. This eventually resulted in him being sacked at the end of 1940 and in retirement by 1942. What irony! He was sacked, because he knew much more than his critics.

In the ensuing Battle of Britain the German Air Force dropped more than 40,000 tons of bombs on towns such as London, Liverpool, Birmingham and Coventry. British bombing losses were 20,325 wounded and 14,280 killed. The German aircraft losses were staggering, 2,700 aircraft destroyed and 600 damaged. British losses were about 900 pilots. The critical day came on the 15th of September 1940 when Goering ordered a massive attack of 328 bombers and 769 fighters to deliver the final blow. Forewarned by Bletchley Park Dowding, with a force of 300 fighters, was able to destroy 187 German planes and to break the offensive. Two days later, on the 17th of September 1940, Bletchley Park decrypted Hitler's order to abandon operation "Sea Lion" and to end the Battle of Britain. Throughout the whole period of the Battle of Britain both Churchill and Dowding had detailed advance knowledge of German battle orders.

(c) 2003 A R Dabrowa