The German-Soviet Boundary Treaty divides occupied Poland
On 28 September 1939, in Moscow, Joachim von Ribbentrop and Vyacheslav Molotov signed the German–Soviet Bounda...
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The Treaty of Melno cedes Samogitia to Lithuania in perpetuity
On 27 September 1422, in the camp on the Osa river and by Lake Melno, east of Grudziądz, Grand Master Paul von...
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The 1921 Peace of Riga draws the Polish-Soviet frontier
The Polish–Soviet War of 1919–1921 hung in the air after the Vistula. Peace talk began in Minsk, on 17 August...
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The First Peace of Thorn returns Dobrzyn to Poland
The Samogitian uprising, in May 1409, brought Poland and Lithuania against the Teutonic Order. The Knights too...
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The Peace of Bautzen leaves Lusatia to Boleslaw
After Otto III’s death, Bolesław I of Poland backed Eckard I of Meissen for the throne. Eckard was murdered at...
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The German-Polish border treaty confirms the Oder-Neisse line
At Potsdam in 1945 the Allies fixed the Oder–Neisse line as the demarcation between the Soviet zone in Germany...
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86 years since Witold Pilecki deliberately entered a roundup for his Auschwitz mission
On 19 September 1940, Witold Pilecki allowed himself to be caught in a German roundup in Warsaw’s Żoliborz dis...
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Donald Tusk Warns of Risk of Further Russian Hybrid Actions Against NATO
Polish Prime Minister Donald Tusk warned parliament on Thursday, 17 September, that Russia may be preparing hy...
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46 years since Solidarity was formed as a nationwide trade union in Poland
17 September 2026 marks 46 years since the meeting in Gdańsk at which representatives of Inter-Enterprise Foun...
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87 years since the Soviet invasion of Poland: 17 September 1939 and the opening of a second front
17 September 2026 marks 87 years since Soviet troops entered eastern Poland. The attack left the Polish state...
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