> and then inexplicably France and England don't attack.
This is easily explained. There was at the time no possible way to coerce the deeply traumatized French and English to attack. When Daladier and Chamberlain came back from Munich in 1938, they were cheered by the crowd in Paris; Daladier told Chamberlain "ils sont contents, les cons" (they're happy, these morons). He was perfectly aware that the vast majority of englishmen - and even more frenchmen, were so deeply against any form of war after WWI that the concept of a preemptive strike was simply unthinkable.
This is easily explained. There was at the time no possible way to coerce the deeply traumatized French and English to attack. When Daladier and Chamberlain came back from Munich in 1938, they were cheered by the crowd in Paris; Daladier told Chamberlain "ils sont contents, les cons" (they're happy, these morons). He was perfectly aware that the vast majority of englishmen - and even more frenchmen, were so deeply against any form of war after WWI that the concept of a preemptive strike was simply unthinkable.