6th. The entrance to the work should always be made in the part least exposed to attack, and if possible in a re-entering angle. 7th Endeavor to present, if possible, a larger front to the enemy than he can occupy in making the attack. 8th. Avoid all ground commanded by an eminence, either in front, flank, or rear. 9th. Never leave the rear of a work so exposed that the enemy may turn it. 10th. Always make the angles of a work in the directions least exposed to attacks, and consequently always present a front to the most exposed. 11th. The garrison should never be drawn up more than two deep; and an ordinary pace of two feet is usually allowed for each file, and from 6 to 8 paces from each piece of ordnance. 12th. If a work is so large as to be defended by a battalion or two, a reserve should be allowed of about one sixth of the number. 13th. The space within a work should always be sufficient for the men to move and lie down. Every soldier will require at least 18 square feet, and every field gun at least 216 square feet. 14th. Provided the line is not made too extensive, the more inward space there is the better. 15th. A parapet to resist cannon shot should never be less than 12 feet thick; and for musquet shot not less than 6 feet. 16th. The height of the parapet must be regulated by the situation of the work, and of the adjoining ground; with this consideration, that its height above the banquette does not exceed 4½ feet. 17th. The depth and breadth of the ditch must be regulated by the quantity of earth required, for the parapet and banquette. 18th. A tete de pont, or work to cover the embarkation of troops, or the passage of a river, should, if possible, be made where the line of the river or coast forms a kind of re-entering angle; that the flanks of the corps, as well as those of the works, may be covered. _To carry on the Work._—The number of workmen must be proportioned to the time allotted for carrying on the work, the quantity of labour, and the number of hands capable of being employed at the same time. When the ditches are broad, the workmen may be posted in two rows; but if narrow, only in one. In the first case, the earth will be thrown by those who are on the outward edge of the ditch to the second row, and by them upon the parapet; for which reason the second row, to keep pace with the first, ought to be twice as numerous. The workmen should never be placed nearer than 2 paces, or 4 feet, from each other; and two men with shovels should be preceded by one with a pickaxe. If more than usual expedition be required, one man with a wheel barrow, or basket, may be added to six or eight with shovels. Another row of workmen should also be placed upon the parapet, to spread the earth and beat it down, as it is thrown up. In fixing the fascines, three men will be sufficient for every 24 feet of the work, who should be provided with two mallets, a saw, and a handbill, or hatchet.