These only consist of a few men, six or eight, and are generally sent on the flanks, and sometimes in the rear of the Enemy's Army, without the knowledge of the Enemy; are to go now and then at a great distance; and are to remain for a considerable time, to make the necessary observations; therefore this is the most difficult duty for Light Cavalry. Many rules laid down for other Patrols are likewise here applicable. A Patrol of this kind marches without Advanced and Rear Guard, and, if the country should require it, only one man rides on the heights without showing himself. If the Patrol proceeds so far, that it is obliged to march with great precaution, it must quit the great roads wherever it is possible, and take its march by bye-roads, deep valleys, &c., &c., to reach unseen the place of its destination. A Guide on horseback will be of great service to such a Patrol; but he is to be paid for it, and treated well. When feeding the horses, it must go off the road into a bush or wood, and one man climbs up a tree to keep a look-out. If anything hostile approaches, the Patrol escapes without noise, and chooses another place of concealment until it can proceed by roundabout ways without danger. A fire can only be lighted with great caution, but it is better to avoid that entirely. If an inhabitant accidentally meets with the Patrol at night, he must remain with it until the march is continued. Should a Secret Patrol be discovered by the Enemy, notwithstanding all precautions, it must fly; as soon as the enemy gives up the pursuit, it must make attempts, by roundabout ways, to get notwithstanding, to the spot where its commission can be carried into execution. This sometimes succeeds beyond expectation. A well-informed and clever officer is particularly required for this kind of duty; who speaks the language of the country, and has a knowledge of the customs, habits, hopes, and fears of the inhabitants. Such a one will be secure close to the Enemy, and be able to give the most certain and best intelligence. It is to be remarked, that if the Leader of a Patrol, when returned, cannot answer the following questions about the roads he passed, viz: Are they rocky, sandy, or boggy? How many rivers and rivulets he passed; and the distances from one to the other? Are the banks of them bold, or only an impediment, &c.? How many bridges lead over them? wooden or massive? Are fords beside those bridges, passable at every season for Cavalry, Infantry, or Artillery, &c.? How many villages are on the road, and what are their names, and the distances from one to the other? Does the road go through wood; or is it at some distance; apparently how large, and what kind? he has lost sight of a principal point of his duty.