A card that came to me via postcrossing.com
From reading online here are some details.
Charles Pierre Péguy (French: [ʃaʁl peɡi]; 7 January 1873 – 5 September 1914) was a noted French poet, essayist, and editor. His two main philosophies were socialismand nationalism, but by 1908 at the latest, after years of uneasy agnosticism, he had become a believing but non-practicing Roman Catholic. From that time, Catholicism strongly influenced his works.
When the Great War broke out, Péguy became a lieutenant in the 19th company of the French 276th Infantry Regiment. He died in battle, shot in the forehead, near Villeroy, Seine-et-Marne on the day before the beginning of the Battle of the Marne. There is a memorial to Péguy near the field where he was killed.