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 especially when they employ indirect laying, their favorite mode of procedure. It is in this kind of fire especially that narrow columns, separated by wide intervals, are a great advantage, because it is pure accident if a projectile falls so that its burst can be observed. Moreover, when the columns are not abreast of each other, the observations of bursts may be contradictory. Thus, in one salvo, "over" and "short" bursts may be obtained, especially if several bursts could not be reliably observed, and the salvo will have to be repeated. When a projectile bursts "short," immediately in front of the 1st company, for example, it may be assumed that the next projectile will be fired at a range increased by 100-200 m. The 1st company should therefore move to the front at double time, the 2nd and 3rd likewise, while the 4th executes platoons front into line and takes to cover in anticipation of an "over" shot. The "over" meant for the 1st company will then be the signal for the 4th company to rush forward. ''The following general rule may be given: A projectile bursting "over" or just "short" of the target requires that the force fired upon move quickly; a projectile bursting far "short" of the target requires that cover be taken.'' The platoon and squad leaders of the attacking force should not betray its presence by standing upright; the force should disappear absolutely without leaving a trace.

A force cannot, in the long run, prevent artillery from effecting an adjustment of fire upon it; all it can do is to postpone the beginning of the fire for effect.

Fire for effect is of three kinds:

1. "Progressive fire" (tir progressif). In this fire, after establishing a bracket (as a rule, one of 200 m.), every piece fires two rounds at each of four ranges, viz., at a range 100 m. less than the short limit of the bracket, at both ranges of the bracket, and at a range 100 m. greater than the long limit of the bracket. For example, if a bracket has been established for