Poisson d’Avril
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.
Easter
As far as possible, French soldiers marked Easter, though tinged with sadness; many fathers took the opportunity to send postcards or letters to their children to show that they were thinking of them, and cards were sent to and by their loved ones. Sometimes Christian services were possible, with music, hymns and communion.
Many cards have a patriotic, propaganda flavour. In this one, the tradition of Easter eggs is surreally taken further and to the soldiers’ delight, the egg cracks open to reveal Alsace (with the black coiffe) and Lorraine (in the lace cap). They are clutching the French flag and Alsace’s dress is tinged with the French colours red, white and blue. The message in the bottom left hand corner is Revanche: revenge, the return of the lost territory, and the cheering soldiers reflect the anticipated joy when the two regions will be restored to France.
This card was sent in April 1915 by two friends to Bruno who was serving at sea. As far as I can find out, he survived the war.
The Blue Line - the Vosges frontier 1871 to 1914 
Very interesting postcard and cultural touchstone. I never would have understood the fish reference without your writing, thanks!
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