In the autumn of 1937, Zhang Ruishu was enjoying a rare break from his 14-hour days on the frontline. One of very few, if not the only, Chinese in Madrid, he hadn’t asked for time off – there was so much to do – but his commander had insisted he take a break. The Spanish capital was decorated with defiant if raggedy banners reading No pasarán (“They shall not pass”) and Madrid será la tumba del fascismo (“Madrid will be the tomb of fascism”). Zhang had seen many such signs before. At a newsstand, however, a large promotional poster for Spanish news magazine Estampa caught his eye.