Thread drift
Without Neville Chamberlain we'd have fought the Battle of Britain with Gloster Gladiators
That is generally accepted. But the failure to capitalise on the German total commitment to Poland in the autumn of 1939 is seen as a mistake. In Jodl's evidence at Nuremberg (bottom of page 350 here
http://www.loc.gov/rr/frd/Military_L.../NT_Vol-XV.pdf) he points out the German weakness in the west at that time.
Back on thread
Corbyn's shenanigans is only the start of a realignment on the left.
But conflicts start through the "other" side misreading signals. cf Bicheno's Razor's Edge. Corbyn's meandering comments may well be creating a greater risk if they are seen as part of a reduction in resolve by European NATO members.