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| 1913 |
| | | Bulgaria launches the Second Balkan War, in the end to the great detriment of Bulgarian interests | |
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| 1913 |
| | | The Balkan states and the Ottoman empire agree an armistice in Bucharest, ending the Second Balkan War | |
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| 1913 |
| | | The Treaty of Bucharest assigns to Greece nearly all the Greek-speaking regions in the Balkans and Mediterranean | |
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| 1915 April 22 |
| | | The Germans attempt an advance on the western front, launching the second battle of Ypres | |
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| 1915 April 22-3 |
| | | The Germans gain ground at Ypres after the first significant use of chlorine gas | |
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| 1915 July 30 |
| | | The Germans make their first effective use of a new weapon, the flame thrower, in an attack on the British in the second batte of Ypres | |
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| 1918 July 18 |
| | | The Allies hold the Germans on the Marne and begin a successful counterattack with tanks | |
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| 1933 |
| | | President Hindenburg appoints Adolf Hitler chancellor of the German republic | |
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| 1933 |
| | | Polish cryptographers succeed in breaking some of the Enigma code used by the German military | |
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| 1933 |
| | | Heinrich Himmler sets up the first Nazi concentration camp, at Dachau near Munich | |
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