Stepping back to the First World War, imagine an enemy that can't be shot, will not surrender and keeps coming back. Worse still, imagine an enemy that has six legs and lives on human blood... We are talking lice! April 1915, its time for the British Army to call in a top scientist. Follow the investigations of  Captain Peacock at  Lice Hunter.      

Eager for the fight, William Falcus, a Tynesider in Canada, enlisted in the 63rd Battalion of the Canadian Expeditionary Force at Edmonton. By June 1916 he was fighting on the Western Front. Read his diary here.