Friedrich Kellner
When the First World War began in 1914, Kellner was called back to active duty. He was an officer substitute in the Prinz Carl Infantry Regiment (4. Großherzoglich Hessisches Regiment) Nr. 118, in Worms. He fought in France at the battle of the Marne. Later, he was wounded near Reims. He was sent to St. Rochus Hospital in Mainz to recover.