consistency between the tables and the graph. The plan of battle from a sailor's point of view The constraints of sailing and sailing vessels The combined French-Spanish fleet left Cadiz harbour in a loose line and turned to the south along the coast of Andalusia, headed for Naples through the Straits of Gibraltar. They were taking advantage of the north-westerly wind which was blowing on the starboard (right) rear quarter, nearly amidships, pushing them along at a slow rate and causing a swell (waves) perpendicular to the wind direction. It struck the ships from the side, causing them to roll and ruining their stability as gun platforms. The column had a predetermined order, which was necessary for sailing, to prevent some ships from getting between the wind and other ships, "stealing" their wind and running the risk of collision. The same wind that was moving the French and Spanish south was also bringing the British north. A sail is basically an airfoil. When full it is curved in such a way as to create a sideways "lift," or force perpendicular to its surface, one component of which is actually against the general direction of the wind. A sailing vessel can thus sail "into the wind." A keel prevents the ship from "slipping," or sliding sideways along the wind. The sails "are full;" that is, fully curved, only at certain angles to the wind direction. The angle is adjustable via "sheets," or lines, which generally have to be winched from the deck. The force required is high, giving rise to the idea that one is "hauling" the ship into the wind, and therefore the ship is "close-hauled." When not full, the sails flap uselessly in the wind, or "luff." The sailors must then change the angle, or "trim the sails," until they fill. A square rigged ship cannot sail within 6 points (67.5 degrees) either side of the wind. If the wind is coming from the north, the closest it could sail would be ENE or WNW. In order to travel in that direction, it must "fall off," or move to an angle with the wind on one side or the other, a "tack." A ship tacks back and forth against the wind, or "beats," each tack earning it some "headway". However, because of the huge distance a square-rigger had to travel before it could fill its sails again, tacking would