The Battle of London 1939–45: Endurance, Heroism and Frailty under Fire by Jerry White On Thursday, August 31, 1939, three days before war against Germany was declared, London was gripped by a sudden panic. A mass exodus began as cars laden with luggage headed out of town. Nine of the main routes away from the city were made one-way and sealed to incoming traffic. Almost overnight some 393,000 schoolchildren, plus a further 257,000 mothers and children under five, were ferried from the capital.