(_a_) Up to 500 yards range, aim should be taken-- About 1 foot in front per 100 yards at a single man walking. About 2 feet in front per 100 yards at a single man doubling. About 3 feet in front per 100 yards at a single horseman trotting. About 4 feet in front per 100 yards at a single horseman galloping. Thus, at 100 yards a soldier should aim about the breadth of a man in front of an individual walking, and at 200 yards about a horse-length in front of a single horseman trotting. (_b_) Beyond close range aim should be taken _at the head of a body of troops moving to a flank_. (ii) =Targets crossing Front Obliquely.=--The general rules regarding aiming up and down laid down in Sec. 21, para. 2, apply also to crossing targets moving obliquely towards or away from the firer. _In firing at such targets, allowance must be made for elevation as well as for aiming-off._ At short range both allowances will be made by individual men. At longer ranges men will allow for aiming up and down, and when necessary fire-unit commanders will allow for aiming-off in fire orders. (iii) =Targets moving directly Towards or Away from the Firer.=--In aiming at an object moving _directly_ towards or away from the firer, allowance for elevation will usually be made _by aiming up or down_--not by waiting to alter sights (Sec. 21, paras. 1 and 2). Section =23=.--Practice in Rapid Adjustment of Sights.[12] =1.= This instruction should be carried out concurrently with instruction in loading in the various firing positions. Frequent small changes of sighting lead as a rule to loss of fire effect, and may be avoided by aiming up or down. _But when there is time the sights will be adjusted for every alteration in the range, and aim will be taken at the lowest part of the mark._ It is essential that men should be trained to adjust their sights accurately and rapidly, and that this power should become to all intents and purposes instinctive, so that this vitally important duty on which fire effect in a large measure depends will be carried out by the soldier with certainty in moments of the most extreme stress and excitement. =2. Training in Rapid Adjustment.=--Instructors will frequently test their squads in setting their sights rapidly and accurately. They will give orders for aiming or firing at definite targets, but without naming the range, and require their squads to adjust their sights before they bring the rifle to the shoulder, judging the distance for themselves, which will help to make the careful adjustment of sights, which is essential for fire effect, habitual to the soldier. Adjustment of sights will also be practised under the same conditions in connection with the movement of the firer or the target, represented by fatigue-men.