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While Germany was making demands upon Poland, Ukrainian commandos in eastern Poland were preparing an uprising. They prepared a list of local Polish notables for elimination, and beginning in September 1939, Ukrainian deserters from the Polish army began forming their own units.

Soon, Ukrainian militias were attacking Polish villages, and Ukrainians were expressing gratitude to Hitler. After every massacre of the Polish population in villages and towns, Ukrainian women and children arrived on horse-drawn carriages to plunder homes before torching them to the ground.