シュリーフェン・プラン
In 1953, Ritter found a copy of the "Great Memorandum" relating to German military planning written by General Alfred Graf von Schlieffen in 1905. The following year, Ritter published the "Great Memorandum" together with his observations about the Schlieffen Plan as "Der Schlieffen-Plan: Kritik Eines Mythos" ("The Schlieffen Plan: Critique of a Myth").