Mobilization in France during the last weeks of peace before the Second World War. In the course of the Security Exhibition, a complete road is reconstructed in a state of alert. The exhibition is to be opened on 16.6.1939 in Paris in front of the Invaliden Cathedral by Edouard Daladier. The exhibition is to be opened on 16.6.1939 in Paris by Edouard Daladier. The picture shows a protective trench made of sandbags, in the middle is a machine gun for air defence.