People are excoriating Biden for losing 13 soldiers as we exited Afghanistan...and of course we are heart broken but the gravest mistake EVER made by the allies was this one: The Failure to Attack Germany After It Invaded Poland. The so called Phoney War.
One of the worst mistakes of the Second World War occurred right at its outset. When the Nazis invaded Poland on September 1, 1939, both Britain and France declared war on Germany — and then promptly did nothing. Not only was this a betrayal of a trusted ally (France and Poland worked together to steal an Enigma machine, for example), it allowed Germany to walk unscathed through Poland at a time when they were ill prepared to defend themselves on two fronts (a theme that would reprise itself some five years later, the war in Italy notwithstanding). It was revealed at Nuremberg trials that Germany could not have withstood an invasion and would have collapses. So 6 million Jews murdered and a total of 50 million human beings lost...thank goodness for Churchill would stood in the breach...and we must end war somehow fellow humans.
I loved this book.