This very important arm is the eye with which the general sees for many
miles to the front and flank. In an advance it pushes ahead, combs the
country for the enemy, disperses his cavalry, and thus protects the
infantry in the rear. It locates the enemy, and occupies his attention
until the infantry comes up. It protects the flanks and rear of the
infantry and artillery during the fight. If needed, it joins in the
fight. If the infantry is defeated it covers the withdrawal, and if the
infantry wins it pursues and pounces upon the enemy.