The idea of a common European defence dates back to the 1950s. Despite its many setbacks, it continues to enjoy popular support from the citizens of the EU, in every opinion poll on the subject. Recent events, throwing the high military risks we are running into sharp relief, have prompted the European leaders to start taking the project seriously once again: the ‘Strategic Compass’ was adopted by the European Council on 25 March. Will we have single defence to go with our single market...