It's difficult to know which side is lying about their claims around 1939 (although 'our' side doesn't even tell us what the german argument is save for a radio station bombing so that should be a big hint).
However, admitted history in 1921 demonstrates a preview of the exact claims Hitler would later make, that Polish militias were slaughtering germans en masse in what should have been german land as was democratically voted on.
https://youtu.be/HwDAorQnd4U?t=14
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