Savile Lumley, Daddy, What Did You Do in the Great War?, London, printed by Johnson, Riddle & Co Ltd, 1915, gift of Great Britain Parliamentary Recruiting Committee, 1914–17, H33861/18

Published by the British War Office in 1915, this widely reproduced poster uses emotive language in the call for participation in WWI. At a time when enlistment was low, this image served as a powerful reminder to 'do one's duty' for future generations.