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===Battle of Britain===

The [[Battle of Britain]], August to September. 1940, was fought for air supremacy over Britain. After the fall of France in June, 1940, Germany believed that it could defeat Britain only by physical invasion, codenamed [[Operation Sea Lion]]. Hitler at least wanted to threaten an invasion, perhaps to force a peace. German [[amphibious warfare]] tactics and capabilities were primitive, and the German Army and Navy believed an invasion could succeed only if the German Air Force could guarantee the Royal Navy would not be able to attack the landing force. To do so, the Royal Air Force had to be defeated. <ref>An invasion was unlikely to succeed; over a third of the days were bad flying weather that grounded most flights. On those days the Royal Navy battleships could plow through the storms and sink the entire invasion fleet.</ref> The Luftwaffe used 1300 medium bombers guarded by 900 fighters; they made 1500 sorties a day from bases in France, Belgium and Norway. The RAF had 650 fighters, with more coming out of the factories every day. Thanks to its new radar system, the British knew where the Germans were, and could concentrate their counterattacks. The Germans used their strategic bombing doctrine to focus on RAF airfields and radar stations. After the RAF bomber forces (quite separate from the fighter forces) attacked Berlin and other cities, Hitler swore revenge and diverted the Luftwaffe to attacks on London. The success the Luftwaffe was having in rapidly wearing down the RAF was squandered, as the civilians being hit were far less critical than the airfields and radar stations that were now ignored.<ref> Civilian deaths were 300 to 600 a day, plus 1000 to 3000 injured. London was not a factory city and aircraft production went up.</ref> The last German daylight raid was September 30; the Luftwaffe was taking unacceptable losses and broke off the attack; occasional blitz raids hit London and other cities from time to time before May 1941, killing some 43,000 civilians. The Luftwaffe lost 1733 planes, the British, 915. The British showed more determination, better radar, and better ground control, while the Germans violated their own doctrine with wasted attacks on London.

The British surprised the Germans with their high quality airplanes; flying close to home bases where they could refuel, and using radar as part of an integrated air defense system, they had a significant advantage over German planes operating at long range. The Hawker Hurricane fighter plane played a vital role for the Royal Air Force (RAF) in winning the Battle of Britain in the summer of 1940. A fast, heavily armed monoplane that went into service in 1937, the Hurricane was effective against both German fighters and bombers and accounted for 70-75% of German losses during the battle. The Germans immediately pulled out their Stukas, which were so slow they were child's play for the Hurricanes and Spitfires. The Battle of Britain showed the world that Hitler's vaunted war machine could be defeated.