Hans von Seeckt
After the end of World War I, the "Reichswehr", under the direction of General Hans von Seeckt, very carefully studied the conduct and developments of the war. The result of the von Seeckt reforms was the new tactical doctrine manual H. Dv.487, "Führung und Gefecht der verbundenen Waffen" ("Command and Battle of the Combined Arms"), now generally known as "das Fug", published as Part 1 in 1921 and Part 2 in 1923.