The active army is the regular army, or permanent establishment. When the decree for the mobilization of the army is promulgated, this force is at once put upon its war footing by drafts from the reserve. The depots are immediately formed, and one-half of the troops stationed therein are drawn from the reserve; the other half being recruits from the Ersatz reserve. As these two classes become exhausted, the depot battalions are filled from the Landwehr, the youngest classes being taken first; or, if needs be, the entire Landwehr is called out in battalions, regiments, brigades, divisions, or even army corps, and sent into the field. After exhausting the Landwehr, there still remains the Landsturm, which embraces all able-bodied men between the ages of seventeen and forty-nine years who do not belong to the active army, the reserve, or the Landwehr. Though the calling out of the Landsturm would imply the exhaustion of the organized forces of the nation, it would be more than a mere levy _en masse_, as it would bring back into the army many soldiers whose twelve years of service would not have been completely forgotten in the midst of civil vocations. The machinery for the rapid mobilization of the army is kept in perfect order. Each army corps, except the Guards, is assigned to a particular province. The province is divided into divisional districts, which are again subdivided so that each brigade, regiment and battalion has its own district, from which it draws its recruits both in peace and war. A register is kept of every man available for military duty, and in time of peace every officer knows just what part he is to perform the minute mobilization is decreed, and each soldier knows where he is to report for duty. The secret of the efficiency of the German military system lies in the division of responsibility, and the thorough decentralization, by which every man, from the monarch to the private soldier, has his own especial part to perform.