Not only was there no obligation to declare war, but it was Hitler's first formal declaration of war in the conflict! So there was no precedent for expecting hi

Not only was there no obligation to declare war, but it was Hitler's first formal declaration of war in the conflict! So there was no precedent for expecting him too. https://en.wikipedia.org/wiki/Declarations_of_war_during_World_War_II https://en.wikipedia.org/wiki/Declarations_of_war_during_Wor...