They are generally placed upon hills, to enable them to have a good view of everything in front. In a mountainous country the ravines and narrow valleys now and then cannot be observed at the top of a hill; in this case a Vidette is to be placed in the bottom. It is desirable to place the Videttes on the top of hills, near a tree or large stone, to prevent the enemy from seeing them, as he may conclude, by seeing one of them, what position the whole line of Videttes and Picquets, and even sometimes the corps to which they belong, have taken up. When the Videttes are placed in such a manner that they can overlook their front, see each other and the ground between them, so that nothing can pass unperceived, they are placed as they ought to be. In order to spare men and horses, no more Videttes than necessary are to be out. In a thick fog the Videttes stationed at a considerable distance on the flanks are taken off the hills and placed on more suitable spots. The country may require that the position fixed upon for the night should be taken up during the day, in which case the country in front must be continually scoured in all directions by small Patrols; which measure always gives sufficient security. _By Night._ The Videttes are taken off the hills, and placed on the roads, behind fords, bridges, ravines, &c., by which the enemy may approach the Picquet. At a clear moonshine they ought to be near a tree or bush, to prevent their being seen by the enemy, as in a close country it may happen that he approaches them unperceived, notwithstanding all their attention. They should be placed at the bottom of a hill, so that any object moving on the top would be easily perceived even in the darkest night. They are by no means to be advanced further than that, their firing can be distinctly heard by the Picquet, even in a stormy night. SECTION VII. INSTRUCTIONS FOR THE VIDETTES, And what the Officer Commanding the Picquet has to observe on their making Signals. _By Day._ 1. When a Vidette discovers anything suspicious on the side of the enemy, should it be a rising dust or the glittering of arms, he should move his horse in a circle at a walk. The Officer should instantly proceed to the Vidette, accompanied by a corporal and four men, and if he cannot distinctly discover by his spy-glass the cause of the dust, he should send off the men that accompanied him, as a Patrol, or go himself; so far that he can report in case he sees Troops, how strong they are, whether consisting of Cavalry, Infantry, or Artillery, but particularly in which direction they march. This report must be dispatched in writing, without the least delay. The Commander of a Picquet should never omit to report occurrences of this kind, although they may have no connexion with the security of his Picquet. Patrols and Picquets must always report the movements of any body of Troops, even of a small number.