While looking for other things I came across this vivid cartoon from Der Schulungsbrief (#1/2/3 of 1942). This was the Nazi Party’s periodical for “political education.” Households were strongly encouraged to subscribe.
It portrayed the Nazi legend that Germany had won World War I militarily, only to be stabbed in the back by Jewish traitors in the homeland. It’s interesting that this appeared early in 1942, after the invasion of the Soviet Union had not proved as successful as expected. Discerning Germans by then were beginning to realize that the war could be lost — an idea propagandists wanted to discourage by suggesting that the only way Germany could lose was through treason.