Three abbreviated prayer books for Jewish soldiers serving in different armies during World War I, and one booklet titled "Der Krieg und wir Juden" ["The War and Us Jews", German]. Berlin, Paris and Philadelphia, 1914-1917. Hebrew, German, French and English. 1. Prayer book for Jewish soldiers in the German army: Feldgebetbuch für die jüdischen Mannschaften des Heeres. Berlin: H. Itzkowski, 1914. Hebrew and German. 29, [1], 22 pp., approx. 13.5 cm. 2. Der Krieg und wir Juden [The War and Us Jews], no. 1 of the booklet series Lamm's Jüdische Feldbücherei for Jewish soldiers. Berlin: Louis Lamm, 1915. German. 61 pp., 13.5 cm. 3. Prayer book for Jewish soldiers in the French army: La Tefila du Soldat. Paris: N. L. Danzig, 1915. Hebrew and French. Including a calendar and a prayer for the welfare of France. 62, [10], 36, [4] pp., 15.5 cm. 4. Prayer book for Jewish soldiers in the American army: Abridged prayer book for Jews in the Army and Navy of the United States. Philadelphia: Jewish Publication Society of America, 1917. Hebrew and English. Including a calendar, a prayer for the welfare of the government, and the lyrics for the songs "America", "Hail, Columbia" and "The Star-Spangled Banner" (all three were sung as unofficial anthems of the USA until 1931, when the "Star-Spangled Banner" was made the official anthem). vi, [1], 80, 85 pp., approx. 15 cm. Condition varies. Some damage. Bindings partly detached, with worming.