Horrible Histories author Terry Deary argues that nations and their leaders are defined by the enemies they make.The surprisingly sadistic Boudica would be forgotten if it weren't for the Ninth Legion, Elizabeth I a minor royal without the Spanish Armada, and Churchill an opposition windbag without the Nazis. Britain loves its heroes so much we have been known to pickle them in brandy to keep them fresh. And after all, every nation sometimes needs a bit of unifying Blitz spirit (although in an ideal world, we wouldn’t have accidentally let Corporal Hitler go in the first place).Britain and the British have a proud history of choosing their enemies, from the Romans to the Germans. You might even say they made Britain what it is today…