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| 1913 |
| | | The Vickers Fighting Biplane No 1 is unveiled in London at the Olympia Aero Show as the world's first purpose-built fighter plane | |
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| 1915 |
| | | Winston Churchill is a firm supporter of a new invention, the tank, encouraging its initial development while still at the Admiralty | |
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| 1915 April 1 |
| | | The French aviator Roland Garros fires a machine gun through the propeller in his fighter plane, using metal plates to deflect any bullets that hit the propeller | |
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| 1915 June |
| | | Dutch aircraft designer Anton Fokker, working for the Germans, vastly improves the Roland Garros technique for firing machine guns through the propellers of fighter planes | |
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| c. 1915 July |
| | | German fighter planes are armed with new machine guns synchronized to fire between the revolving propeller blades | |
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| 1915 |
| | | from December - the 225-horsepower Eagle, the first of many Rolls-Royce aero-engines, is used to power British bombers | |
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| 1925 |
| | | A Protocol signed in Geneva probibits the use in warfare of poisonous gas and bacteriological weapons | |
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| 1936 |
| | | The prototype of the Spitfire, designed by Reginald Mitchell, has its first test flight | |
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| 1939 August 2 |
| | | German-born US physicist Albert Einstein writes to President Roosevelt, warning of the potential of an atomic bomb | |
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| 1942 April |
| | | British engineer Barnes Wallis designs a bouncing and rotating bomb for use against German dams | |
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