Nowadays, as formerly, it will still find work to its hands on the battle-field itself, and this work will be all the more important in proportion as the quality of the forces therein encountered is on a lower level (_e.g._, new formations, Militia, etc.). In any case, however, great results on the battle-field can only be expected from the employment of numerically formidable 'Masses.' This is conditioned by the very fact of the numbers which we must in future expect to see engaged. The portion of the enemy's forces affected by the results of a successful charge must be a sufficient part of the whole which, at a given time and place, is concerned in the task of endeavouring to secure a decision. Other factors also deserve consideration--above all, the increased range of modern firearms. If the front of the attacking Cavalry is too narrow, it will not only have to face the fire of the troops immediately in its front, but it will be the focus of the fire from all sides. If the formation for attack does not supply a sufficient sequence of successive efforts, then in many cases it can have no hope of permanent result, for an onslaught by a single line will not have strength enough to pierce the fire zone, and will be shot to pieces before it can reach the enemy.[2] [Footnote 2: The same point also arises both in pursuit and in the covering of a retreat, two of our most important duties; for though, as already pointed out, the conditions of the present day offer to the Arm the opportunities of the richest harvests, it will only be able to utilize them when employed with concentrated force.] The masses to be encountered are numerically so considerable that single squadrons, regiments, or brigades, hardly count in the scale of a great decision. Partial results they may, indeed, attain, but to bring about the defeat of a whole Army, or even of an important fraction of it, to reap the fruits of such a victory or cover a great retreat, numbers alone can avail. How many units to employ under any given circumstances it is, of course, impossible to lay down beforehand; but the essence of the matter is that the limit of force to be thus employed is far in excess of what any existing tactical unit can supply.