nationalism
This piece of propaganda urges men to join the army, in order to fight the foreign invader. It shows the soldiers walking decidedly, focused on their goal. The red letters also stand out from the black and white background, stressing the importance of defending the country. It calls for action, appealing to nationalism. The propaganda refers to the fact that over a million Belgians had to leave their own country, while the Germans occupy it, and that "you" must do something to defend Belgium.