Even in war conditions, in an atmosphere which was far from funny, the French soldier might recall the absurd, fun tradition of poisson d’Avril (where a child sticks a paper fish on a victim’s back as an April Fool’s Day trick) by sending a postcard. This one has a particularly patriotic theme: Alsace personified is tied to a tree somewhere in recognisably Alsacien mountain terrain. However, an heroic French soldier is appearing riding a fish to her rescue. The fish’s colours of red and white, combined with his blue, signify patriotism. A German soldier is just seen skulking away. The image is ludicrous but the message is hopeful and serious: “Dearest Alsace! Liberty at last!”
This card from my collection was posted on 1st April 1915.
The Blue Line - the Vosges frontier 1871 to 1914 