@jon-nyc
Churchill was a Francophile and to the very end always believed France would do the right thing. Chamberlain on the other hand was a realist and knew France, despite the size and strength of its army, would not lift a finger to come to Czechoslovakia’s aid. The only other continental army remaining other than Germany’s, was the Red Army. Stalin was most willing to intervene on the side of Czechoslovakia provided either  France or Britain would also mobilize against the Nazis. While the Royal Navy could have sailed against the kriegsmarine there was no British army to speak of in 1938 to even deploy onto the continent let alone march on Germany from the west.