What if the French had refused to go to war over Poland in 1939? The British give their ultimatum as OTL, but the French decide to not participate because the Kasprzycki–Gamelin Convention was not legally binding and not ratified until after the German attack. Foreign Minister Georges Bonnet wrote that the agreement is full of gaps needed to keep France away from war. So from September 3d 1939 Britain is at war with Germany - but France is not. How do things go from here?