First World War - Carlton Hotel

Recruitment posters reading 'Fall in ye sons of the Empire, the king and country need you today, young men you are needed to fight, to arms!, we are fighting for a worthy purpose, to arms!, your country needs you, to arms!, enlist at once, Britons enlist at once for the duration of war, we must have more men, men of Britain uphold your country's honour, England expects every man this day will do his duty, no price can be too high when honour & freedom are at stake' adorn the exterior of the Carlton Hotel, on the corner of Haymarket and Pall Mall in London, England, March 1915. At the start of the First World War, Britain had to rely on volunteers to enlist as National Service was only introduced in January '16. (Photo by Archive Photos/Getty Images)