As I have already indicated above, the patrol must be perfectly clear as to what facts are most important from the Head Quarters' point of view. If the opposing armies are still so far apart that a collision cannot be expected, only those matters that are of strategic importance need be ascertained and transmitted: _e.g._ number of the hostile columns, objective of the day's march, any circumstances that lend themselves to a conclusion as to alterations in the enemy's direction of march or the combination of his forces. In such a case there is no need for information as to details. The closer, however, the opposing armies approach one another, the more does information which is of tactical significance increase in importance. It is not always advisable to confine oneself to reporting the bare facts. It will often be desirable to indicate also the process of reasoning by which the reporting officer arrives at his impression, for this originates from a number of _imponderabilia_ which cannot always be detailed in a report. When this is done, it must be thoroughly and carefully considered how far this personal impression is dependent upon facts, or if it does not rather rest upon certain feelings, as to the cause of which no clear account can be given. Should the latter be the case, the personal point of view is best left out. Preconceived opinions originate but too easily in war, and may lead to a biassed interpretation of reports, and, consequently, to faulty dispositions. The facts must always be weighed with sober impartiality. Only thus can a true and definite appreciation be arrived at. The same naturally holds good for those reports which are sent in from the reconnoitring squadrons or other reporting centres. The method in which such information is sifted for passing on brings into play, in a certain sense, personal conceptions. It is therefore all the more necessary to reflect seriously over their preparation. It is imperative that any important information should reach the Head Quarters of the army or the Great Head Quarters as early as possible, at all events, early enough to allow of the measures rendered necessary by the enemy's movements to be initiated and carried out. The patrol leader must therefore consider the time requisite for a wheel or other such movement of a modern army in order to calculate what is the latest time, under any circumstances, that his information must be sent in. It is obvious, and has already been demonstrated, that he should be instructed as to the advance of his own army in order that he may be able to appreciate these matters.