Carl Croneiß was born on January 9, 1891 in the town of Bad Dürkheim, Rhineland-Palatinate. He joined the German Army in 1911 as a cadet in the Infantry Regiment “Prince Carl” (fourth Grand Ducal Hessian) no. 118.
In autumn 1915, Croneiß was assigned to the German military mission in Constantinople. He spent the following war years as a pilot in the Ottoman Air Force.In 1918 he became the commander of the flying school in San Stefano.
Carl Croneiß was retired from the army in 1920 with the rank of captain. During the war, he was awarded the Iron Cross of both classes, the Friedrich-August Cross of both classes, the Knight’s Cross of the Albrechts Order with Swords, the Hessian Medal of Bravery , the Austrian Military Merit Cross III. Class with swords, the Ottoman Imtiaz and Liakat medals , the Mecidiye Order , the Iron Crescent , and the Wound Badge in black.