«Propaganda in the form of posters, postcards, and trade cards flourished during World War I due to developments in print technology that had begun in the 19th century. Governments on both sides of the conflict invested in printed matter that rallied public sentiments of nationalism and support for the war while also encouraging animosity toward the enemy.»
During wartime, large-format, full-color posters plastered walls from city streets to classrooms. They mobilized support for the war effort, summoned donations to charities, encouraged participation in war bonds, and publicized victories in notable battles to a broad public. Illustrators of varying renown were called on to produce forceful images whose meaning could be quickly and easily grasped by a diverse audience.
British propaganda in the First World War is often heralded as being a major contributor to victory. In 1933, the Nazi propagandist Eugen Hadamovsky stated:
"The German people were not beaten on the battlefield, but were defeated in the war of words."
As perhaps the world’s first true ‘media war’, posters and newspaper adverts certainly played a role in encouraging young men to sign up (UK had no draft), sustaining morale, demonizing the enemy and building unity and solidarity.