while seventeen hours were non-military, which included general history, mathematics, science and a choice of French or Russian. Roughly the same time allocations were used in the last two years. Lectures were supplemented by visits to fortifications, arms factories and exercises of the railway regiment. During the three month summer breaks the students attended manoeuvres and were taken on field tactical exercises in which they commanded imaginary units. At the end of the course they took their second examination. Only about thirty students passed this extremely difficult test. They were then assigned (kommandiert) to the Great General Staff, while retaining their regimental attachments. After two years they took their third and final examination, after which five to eight officers were permanently posted to fill vacancies in the General Staff a remarkable winnowing from the many who had entered the competition. See also Bundeswehr Command and Staff College established in 1957 as the successor of the Prussian Military Academy Command and General Staff College -- United States Staff College, Camberley -- United Kingdom General Staff Academy -- Imperial Russia Army War College -- Imperial Japan École Supérieure de Guerre -- France List of government-run higher-level national military academies References Staff colleges 1810 establishments in Germany Military academies of Germany Military of Prussia Defunct military academies