Pigeons carrying vital messages to and from the beleaguered city during the Siege of Paris; horses and mules struggling through miles of fetid mud to bring ammunition to the front in the Great War; dogs sniffing out mines for the British invasion force in the Second World War - countless brave animals have played their part in the long, cruel history of war. Some have won medals for gallantry - like G.I. Joe, the American pigeon who saved 100 British...