When the signal to form a line of bearing for either tack is made, the ships (whatever course they may be directed to steer) are to place themselves in such a manner that if they were to haul to the wind together on the tack for which the line of bearing is formed, they would immediately form a line of battle on that tack.

To do this, every ship must bring the ship which would be her second ahead, if the line of battle were formed, to bear on that point of the compass on which the line of battle would sail, viz., on that point of the compass which is seven points from the direction of the wind, or six points if the signal is made to keep _close_ to the wind.
As the intention of a line of bearing is to keep the fleet ready to form suddenly a line of battle, the position of the division or squadron flags, shown with the signal for such a line, will refer to the forming of the line of battle; that division or squadron whose flag is uppermost (without considering whether it do or do not form the van of the line of bearing) is to place itself in that station which would become the van if the fleet should haul to the wind and form the line of battle; and the division whose flag is undermost is to place itself in that station in which it would become the rear if by hauling to the wind the line of battle should be formed.[4] VIII.

When a line of bearing has been formed, the ships are to preserve that relative bearing from each other, whenever they are directed to alter the course together; but if they are directed to alter the course in succession, as the line of bearing will by that be destroyed, it is no longer to be attended to.
IX.

If the signal to make more or less sail is made when the fleet is in line of battle, the frigate appointed to repeat signals will set the same sails as are carried by the admiral's ship; the ships are then in succession (from the rear if to shorten, or the van, if to make more, sail) to put themselves under a proportion of sail correspondent to their comparative rate of sailing with the admiral's ship.
To enable captains to do this it will be necessary that they acquire a perfect knowledge of the proportion of sail required for suiting their rate of sailing to that of the admiral, under the various changes in the quantity of sail, and state of the weather; which will enable them, not only to keep their stations in the line of battle, but also to keep company with the fleet on all other occasions.
When the signal to make more sail is made, if the admiral is under his topsails he will probably set the Foresail.
If the signal is repeated, or if the foresail is set he will probably set Jib and staysails.
If the foresail, jib, and staysails are set, he will set the Topgallant-sails.
Or in equally weather Mainsail.
When the signal to shorten sail is made, he will probably take in sail in a gradation the reverse of the preceding.
X.Ships which are ordered by signal to withdraw from the line are to place themselves to windward of the fleet if it has the weather-gage of the enemy, or to leeward and ahead if the contrary; and are to be ready to assist any ship which may want their assistance, or to act in any other manner as directed by signal.
If the ships so withdrawn, or any others which may have been detached, should be unable to resume their stations in the line when ordered by signal to do so, they are to attack the enemy's ships in any part of the line on which they may hope to make the greatest impression.[5] XI.

If the fleet should engage an enemy inferior to it in number, or which, by the flight of some of their ships, becomes inferior, the ships which, at either extremity of the line, are thereby left without opponents may, after the action is begun, quit the line without waiting for a signal to do so; and they are to distress the enemy, or assist the ships of the fleet, in the best manner that circumstances will allow.
XII.