I can state with absolute certainty Gnome that had the RAF had to fight the Luftwaffe over the skies of Kent in late 1938/early 1939 with no Chain Home and relying on Gloster Gladiator fighters then the German Luftwaffe would have won. That didn't actually happen, but anybody with any knowledge of the period, combat flying and the performance and capabilities of the aircraft in question would tell you the same as I have done - Great Britain would have lost the Battle of Britain if it had been fought under such conditions. It didn't solely because of what Chamberlain did to secure an agreement in Munich in 1938.

If German armed forces managed to ramp through the defences of three countries fully prepared for war in 1940 in just 46 days, just think how much easier and quicker it would have been for them to do against countries totally unprepared for war in 1938. Outcome never in doubt just the time it would have taken.

No guesswork, no imagination required.