Churchill and the 1936 Rhineland crisis

Why might a Churchill premiership change the timeline before the Czechoslovak crisis of 1938?

Because the 1936 remilitarization of the Rhineland offered an earlier confrontation, when a firmer British and French response might have forced a German withdrawal and changed later decisions.

A follow-up asks why the earlier Churchill scenario does not simply move the outbreak of war to Czechoslovakia in 1938. The remilitarization of the Rhineland in 1936 provides an earlier test at which Churchill might issue a firmer warning. Hitler was prepared for the possibility of withdrawal, so a determined response could alter his later choices and the political balance inside Germany. British action would still depend on French war planning and unstable French domestic politics.