"In wartime, a person allows himself many things that he would ask the rabbi about in peacetime. But, in fact, these days there is hardly anything to ask about. There is no slaughter of cows or chickens; there is scarcely any milk or meat in the homes of the Jews in the Ghetto. On the other hand, there are questions that are specific to wartime:
Should one hold a Seder on Passover eve when there is no wine for the four cups, no matzot? Are the weak and the ill permitted to eat on Yom Kippur? Are the sick permitted to desecrate the Sabbath? Can the weak and ill eat meat that is not ritually slaughtered because kosher meat is hard to find and also costs a great deal of money?"
From Rabbi Shimon Huberband’s writings

Ringelblum Archive, Jewish Historical Institute, Warsaw, Poland.