Here's the back of the card, sent to Louis Madeline, who was a soldier stationed in Saint-Mihiel, in the Meuse department of Lorraine, France during World War I. There's no date on the card, so it's impossible to know if he was there during the
Battle of Saint Mihiel, led by U.S. General, John Pershing. I also wonder if this Louis Madeline is the
French architect who was born in 1892 and died in 1962.
The message reads:
Saint-Martin-des-Champs
Dear Cousin,
I wish you well and happy and above all that it passes quickly.
Your cousin
Emile (Guy?)