History of Poland during World War I
While Poland did not exist as an independent state during World War I, its geographical position between the fighting powers meant that much fighting and horrific human and material losses occurred on the Polish lands between 1914 and 1918. At the start of World War I, Polish territory was divided between the Russian, German and Austro-Hungarian empires, and became the scene of many operations of the Eastern Front of World War I. In the aftermath of the war, following the collapse of the Russian, German and Austro-Hungarian Empires, Poland became an independent republic.
Source: Wikipedia — History of Poland during World War I (CC BY-SA 4.0)