The slogan on a Spanish Republican poster, circa 1937, now hanging in the Imperial War Museum in London. The Spanish Civil War was the precursor to the Second World War: the fascist rebels, led by General Franco, were aided by Nazi Germany, who used the conflict as an opportunity to roadtest devastating new weapons and strategies. The poster shows a sky filled with the deadly crosses of fascist aeroplanes, under which was a photograph of a little girl killed by blitz bombing. The message was stark and brutal and simple: dead children in Spain today, dead children across the world tomorrow.
Thousands joined the International Brigade in response, including George Orwell and Ernest Hemingway... but the world at large remained unmoved. And within five years all mainland Europe felt the terror of the fascist war machine.