The Great Poland Uprising against the Germans begins.

Greater Poland uprising (1918–1919)

1918-19 military insurrection in German-occupied Greater Poland

The Greater Poland uprising of 1918–1919, or Wielkopolska uprising of 1918–1919 or Poznań War was a military insurrection of Poles in the Greater Poland region against German rule. The uprising had a significant effect on the Treaty of Versailles, which granted a reconstituted…