Ad: This forum contains affiliate links to products on Amazon and eBay. More information in Terms and rules
I am not including Commonwealth nations, since they had the automatic support of Britain.
More like Britain had the automatic support of the Commonwealth.
Finland for me. I agree cchees point about Switzerland but since they didn't engage in the war, except for occasional attacks on US aircraft seeking neutral sanctuary
the Dutch (which I know best) managed to shoot down about 400 of the 929 German planes deployed against them. That's about 40% in 5 days, not bad eh.