The first to be done is to report what is going on, and in a mountainous and woody country at the same time to acquaint the Picquets on the flanks with it. After this the Picquet advances, but in such a manner that it cannot be cut off, and begins to skirmish. It will seldom be practicable or suitable to advance farther than the chain of Videttes. Is the Officer obliged to retire, it must be done as slow as possible, to gain time for the Corps to turn out. If the Commander of the Picquet has previously fixed upon places where to make a stand, as prescribed in Section II., it is now time to make use of them, when he has retired so far. The best way for cavalry to defend a bridge, ravine, or ford, is the following (fig. 2): [Illustration: _Fig. 2._] When the Picquet has been obliged to retire three or four hundred yards to the bridge, the Officer is to gallop over it with the same, and to post himself in A, as close as possible, with his right flank on it, leaving the passage open. As soon as his skirmishers see that he has taken up his position, and that the passage over the bridge is open, they likewise gallop over it, and face about again in B. The Enemy will certainly halt, and if he pushes on, those in A have only to cut him down as he is not in a state of defence, being obliged to expose his left flank: those in B charge likewise, or fire upon him at eight yards' distance. In this manner the Enemy must halt, and is obliged to retire a little, in order to throw skirmishers in C, to drive away the Picquet by their fire. However, time is gained by this, on which sometimes the honor and welfare of the Corps depend. This consideration only could induce me to be so circumstantial upon this subject. When the Picquets on the flanks are not attacked at the same time, they can be sometimes of service in acting upon the Enemy's flanks; yet the nature of the ground must not endanger them to be cut off. But however favorable the ground may often be, it appears sometimes surprising to see that the nearest Picquets frequently do not undertake anything on such occasions, and behave exactly as if the whole business did not concern them at all. In general, it is a rule that the Picquets that are not attacked, retire in a line with those engaged. _By Night._