 During the Great War, Rosenstock-Huessy served as a captain in the German army where he fought on the Western front. In 1916 he began an intense correspondence with Rosenzweig (now published in English as Judaism Despite Christianity) who by that time had decided not to follow Rosenstock-Huessy and his cousins, the Ehrenbergs, into Christianity, but to fully embrace the Jewish faith into which he had been born. That correspondence has remained a major post-Nietzschean Christian/Jewish dialogue. While in that correspondence Rosenstock-Huessy was uncompromising in his insistence that Judaism was a spent historical force, he continued to reflect upon Rosenzweig’s decision to remain a Jew throughout his life. He came to the opinion that Rosenzweig had convincingly demonstrated the eternal role of Judaism in the human story.