If the different units of the regiment are separately well trained it requires few exercises to make a team of them, good regimental work is largely a question of the tactical skill and ability of the colonel. If he is competent and the units are separately well trained the regiment is trained. Placing these well trained units in the hands of an incompetent regimental commander is but placing a fine and complicated machine in the hands of an unskilled operator; there is a fair chance that he will ruin the machine. V ARTILLERY FIRE [Sidenote: Object of study of artillery] Except in small engagements in detachment warfare the infantry will have the assistance of friendly artillery and will be opposed not only by infantry but by artillery fire. Some knowledge of artillery, its use, the effects it can produce and how best to utilize the aid afforded by our own and to meet the opposition of the enemy’s, is therefore necessary for the infantry officer and also for the men in ranks. While familiarity with the artillery will be far from breeding contempt, it will enable the infantry to escape much unnecessary loss and, by correcting the false conception so many have of its power, it will improve the morale of our men. This chapter is not intended to teach infantry officers what they should know about artillery and its use. It is offered merely as a suggestion as to what our men should be taught and how to train them to meet certain phases of this fire. The officer should know much more about the subject and must go to more extended works by more competent men for the instruction. Artillery is effective against infantry both physically and morally. The moral effect is the greater, the less instructed and trained is the man. Most untrained men have very exaggerated ideas as to the effectiveness of artillery, they know nothing but guess much. It is the terror of the unknown. [Sidenote: Classes of artillery] There are two general classes of artillery that accompany an army: light and heavy. The light artillery may be rifles or light howitzers; the first have a flat trajectory, the others, of greater caliber, have the advantage of being able to use high angle fire. Mountain and horse artillery are merely subdivisions of the light artillery and, except that the mountain artillery is less effective at long ranges than the others, “all look alike” to the infantry advancing under their fire.