=Rôle of the Artillery during the Attack.= During the attack the artillery carries out the following different fires: Counter-battery fire. Protective fire on the flanks of the attack. Accompaniment or barrage fire. The first two fires are executed by a part of the artillery directly under the chief of artillery of the division, who in turn is under the control of the general. The third kind of fire is executed by the support artillery, detailed to the different assaulting battalions as in the defensive organization. The action of this artillery directly interests each infantry chief of area, to whom are sent liaison detachments and observers (an officer, N. C. O.’s, and artillery orderlies). This third kind of fire is the only one that we will consider in detail. =Principle of the Accompaniment Fire.= During the progress of the attack the support artillery establishes a moving barrage in front of the advancing infantry. This barrage travels by bounds. It remains for a certain time on each defensive line and at intervals between them so as to thoroughly sweep the intervening ground. The time-table, or rate of this moving barrage, is laid down in the plan of action of the artillery. The infantry leaders of course are acquainted with this time-table. =Other Means of Controlling the Barrage.= The moving barrage may also be advanced successively by order of the commanding general according to information received from the leading elements of the assaulting battalion, from the artillery or aëroplane observers. Calls may be made directly from the line of combat by rockets, or other means of liaison. With reference to the barrage there are two uses of rockets; one is for calling the barrage in the defensive, and the other is calling for an advance of the barrage during the attack. It may be remarked that it is impossible to call for a decrease in range of the barrage as this, of course, would be dangerous to your own troops. It is better to decrease the rate of advance of the barrage rather than to have it move too quickly and risk abandoning the infantry.