The population encountered numerous precautions protecting civilians from the consequences of air-raids. Because even the smallest speck of light could provide a point of orientation for allied bombers, the German occupier issued a blackout decree right away. Posters encouraged people to stay at home when the air-raid sirens were sounded, or else to seek out an air-raid shelter immediately.

The danger from the skies was a serious threat. Allied bombardments were mostly aimed at German military targets, but civilian casualties and substantial material damages were unavoidable in these air-raids. German propaganda skilfully played up the horror this caused among the population. Posters condemned these 'cowardly allied terror bombardments' with great indignation.