The further advance will now be a matter of the greatest difficulty, for the reinforced firing line will offer a considerable target to the defenders, and that at decisive range; it will only be possible to approach closer to the enemy when the movement of one portion of the firing line is supported by the fire of the remainder, but whether the advance to the next fire positions is to be made by alternate rushes of complete portions of the firing line, or by pushing forward a few extended men as from a fresh starting point, covered by the fire of the rest, and gradually reinforcing them, thus building up a fresh firing line, must depend on varying circumstances such as the nature of the ground and the volume of the enemy’s fire, and the choice of method must therefore be left to subordinate commanders, who alone will possess any control at this stage of the fight. 4. On open ground and at effective ranges long lines of men rising simultaneously, and making even short rushes forward, will generally suffer heavier losses than small bodies suddenly moving forward, as the latter surprise the enemy, and thus for a time avoid his aimed fire. The rush should be continued only as long as the surprise lasts. The closer the ranges, the shorter should be the rushes. 5. It is by no means necessary that the firing line should be everywhere of the same density. It is from covered positions that fire is most effective; and it is at these points, therefore, that force should be concentrated. 6. The firing line, which will be continually strengthened by successive reinforcements, will thus fight its way forward until the immediate objective is enveloped, or partially enveloped, at the closest range by a strong firing line, which, in combination with the artillery will bring as powerful a fire as possible to bear against the defence, in order to rapidly establish a superiority of fire preparatory to the assault. 7. Positions affording cover in advance of the enemy’s main position, which may be seized or occupied, should, if necessary, be put in a state of defence; here the troops will re-form and a further advance made by repeating the process of attack against the next objective, as from a fresh starting point. =137.= _The Assault._ As soon as it becomes evident that superiority of fire has been attained, which is generally made known by movements to the rear along the enemy’s line, or by the decreasing accuracy and volume of his fire, the troops detailed to drive home the attack will close in on the firing line, and carry it forward to the assault. The signal for this decisive movement should, as a rule, come from the senior officers present, and be sounded on the bugle. But the method of advance must be left to the company officers, for at such short range it is not possible to transmit the necessary orders all along the line.