Keep Calm and Carry On: that’s not how people felt as the second world war loomed. But maybe, as Trump stalks, that old slogan is finally making senseIt has become known as the “war of nerves”. An apt name for a jittery, jangling time in British history, consumed with fear of what may be coming, in which the sheer unpredictability of life became – as the historian Prof Julie Gottlieb writes – a form of psychological warfare. Contemporary reports describe “threats of mysterious weapons, gigantic bluff, and a cat-and-mouse game intended to stampede the civilian population of this island into terror”.It all sounds uncannily like life under Donald Trump, who this week marched the world uphill to war, only to amble just as inexplicably back down again. But Gottlieb is actually describing the period between the Munich crisis of 1938 and the blitz beginning in earnest in September 1940. Her fascinating study of letters, diaries and newspapers from the period focuses not on the big geopolit...