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| 1926 |
| | | Karel Szymanowski's opera King Roger has its first performance in Warsaw | |
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| 1928 |
| | | Karol Szymanowski's Stabat Mater is performed in Warsaw and brings him international fame | |
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| 1933 |
| | | Polish cryptographers succeed in breaking some of the Enigma code used by the German military | |
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| 1938 September 30 |
| | | Poland insists that the industrial area of Teschen Silesia, largely inhabited by Poles, be ceded by Czechoslovakia | |
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| 1938 October |
| | | Adolf Hitler makes unacceptable demands upon Poland, including the transfer of the free port of Danzig to Germany | |
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| 1938 October |
| | | Adolf Hitler demands a strip of territory through the Polish corridor to reunite Germany with East Prussia | |
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| 1939 March 31 |
| | | The recent fate of Czechoslovakia prompts France and Britain to guarantee the security of Poland | |
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| 1939 August |
| | | A Franco-British military mission arrives in Moscow to persuade Stalin to join a pact in defence of Poland | |
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| 1939 August 21 |
| | | A secret protocol, attached to the Molotov-Ribbentrop Pact, divides Poland and the Baltic states between Germany and Russia | |
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| 1939 September 1 |
| | | Adolf Hitler launches a massive attack on Poland, with tanks crossing the border and air raids on Warsaw | |
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