9. The time for the Picquet to go to the Night Post is when it becomes too dark for the Videttes to see at any distance. They are then called in, and the position for the night taken up. In case of any desertion, or that there are apprehensions of being betrayed to the enemy, by the inhabitants or spies, the Picquet should change its ground, but the Videttes remain. At night the Videttes must be relieved every hour and visited every half hour. The Videttes should at all times be double if possible. In foggy weather, and when it is very dark, the double Videttes should patrol among themselves, and communicate with one another. When the Enemy is near, the following measure contributes not only to security, but is the best method of knowing when the enemy is on the move: A few men should patrol during the night beyond the chain of Videttes in different directions, and as near the enemy as they can unperceived; they should then dismount and listen with the ear to the ground. 10. Every person attempting to pass the Outpost must be detained till the morning. After the morning Patrol has returned, or has reported that all is well, the Picquet should take up its position for the day. 11. Videttes should be placed by day on a high ground, so as to have an extensive view, but if possible near a rock or tree, so as not to be perceived by the Enemy; 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. 12. By night, Videttes are taken off the hills and placed on the roads, behind fords, bridges, ravines, &c.; they should be placed at the bottom of hills, so that any object moving at the top would be easily perceived. They should by no means be advanced further than that their firing can be distinctly heard by the Picquet.