DELBRUCK, HANS (1848-1929), German historian, was born at Bergen on the island of Rifigen on Nov. 11, 1848, and studied at the universities of Heidelberg and Bonn. He saw active service in the Franco-German War, and was afterward tutor to Prince Waldemar of Prussia (1874-79). In 1885 he became professor of modern history in the university of Berlin. From 1884-90 he sat as a conservative in the German reichstag. Delbriick's writings are chiefly concerned with the history of the art of war, his most ambitious work being his Geschichte der Kriegskunst im Rahmen der politischen Geschichte (first section, Das Altertum, 1900; second Romer and Germanen, 1902; third, Das Mittelalter, 1907; fourth vol., 1921). Among his other works are: Die Perserkriege and die Burgunderkriege (Berlin, 1887) ; Historische and politische Au f satze (1886) ; Erinnerungen, Au f satze and Reden (1902) ; Die Strategie des Perikles erlautert durch die Strategie Friedrichs des Grossen (189o) ; Die Polen frage (1894) ; Das Leben des Feldrnarschalls Gra f en Neithardt von Gneisenau (1882 and 1894) ; Krieg and Politik (3 vols., 1919), Ludendorff, Tirpitz, Falkenhayn (192o), Weltgeschichte (1923-26, 3 vols.) and Vor and Nach deco Weltkrieg (1926). Delbriick began in 1883 to edit the Preussische Jahrbiicher, in which he has written many articles, including one on "General Wolseley Tuber Napoleon, Wellington and Gneisenau," and he has contributed to the Europaischer Geschiclitskalender of H. Schul thess. After the World War he was appointed member of the commission to publish German archives. He died July 14, 1929.