Reserve army

Definition and stakes

Portrait of Robert W. Chambers Robert W. Chambers Lorraine: A Romance

It is a mistake into which many fall to believe that the reserve is the rear of the regular army. The war strength of a regiment is just double its peace strength, and the increment is the reserve. The blending of the two in time of war is complete; the medalled men of 1866 and of the Holstein campaign, called up from the reserve, are welded into the same ranks with the young soldiers who are serving their first period of three years. It is an utter mistake to think of the Prussian army or the Prussian reserves as a militia like yours or ours.
Source: Gutenberg

baron de Antoine Henri Jomini The Art of War

Whenever an army takes the offensive, it should always contemplate the possibility of being compelled to act on the defensive, and by the posting of a reserve between the base and front of operations the advantage of an active reserve on the field of battle is gained: it can fly to the support of menaced points without weakening the active army. It is true that to form a reserve a number of regiments must be withdrawn from active service; but there are always reinforcements to arrive, recruits to be instructed, and convalescents to be used
Source: Gutenberg

baron de Antoine Henri Jomini The Art of War

These reserves are particularly useful when the configuration of the country leads to double fronts of operations: they then fulfill the double object of observing the second front, and, in case of necessity, of aiding the operations of the main army when the enemy threatens its flanks or a reverse compels it to fall back toward this reserve.
Of course, care must be taken not to create dangerous detachments, and whenever these reserves can be dispensed with, it should be done, or the troops in the depots only be employed as reserves.
Source: Gutenberg

Get perspective with Kwize: daily news enlightened by great literature