He wouldn't have bummed off to america. He planned to move to the midlands and fight from there.
He did fuck up a few times (Moving in to Greece before kicking the the Italians out of North Africa) but he was a good motivator and he motivated the British public. I could imagine his "fight them on the beeches" speech galvanised the British public.
Luckily for us the Charlie Chaplin lookalike fucked up more times then winnie