Well, I remember reading Wiech about hardships of everyday life and shortages in shops: people "were queuing for wooden bread." There was no sugar or meat.
Also, Germans massacred Kalisz in 1914, killing hundreds of innocent civilians.
Pogrom of Kalisz
en.wikipedia.org/wiki/Destruction_of_Kalisz
most if not all church bells were confiscated to be recast as ammunition
Yes, I will never forget those photos: