During the day the wind shifted to west, still fair for the British and allowing the allies, by going about, to head south. It was still very weak, so that the progress of the fleets was slow. During the night both manœuvred; the allies to gain, the British to retain, the position they wished. At daybreak of the 21st they were in presence, the French and Spaniards steering south in five columns; of which the two to windward, containing together twelve ships, constituted a detached squadron of observation under Admiral Gravina. The remaining twenty-one formed the main body, commanded by Villeneuve. Cape Trafalgar, from which the battle took its name, was on the south-eastern horizon, ten or twelve miles from the allies; and the British fleet was at the same distance from them to the westward.

Soon after daylight Villeneuve signalled to form line of battle on the starboard tack, on which they were then sailing, heading south. In performing this evolution Gravina with his twelve ships took post in the van of the allied fleet, his own flag-ship heading the column. It is disputed between the French and Spaniards whether this step was taken by Villeneuve's order, or of Gravina's own motion. In either case, these twelve, by abandoning their central and windward position, sacrificed to a great extent their power to re-enforce any threatened part of the order, and also unduly extended a line already too long. In the end, instead of being a reserve well in hand, they became the helpless victims of the British concentration.

At 8 A. M. Villeneuve saw that battle could not be shunned. Wishing to have Cadiz under his lee in case of disaster, he ordered the combined fleet to wear together. The signal was clumsily executed; but by ten all had gone round and were heading north in inverse order, Gravina's squadron in the rear. At eleven Villeneuve directed this squadron to keep well to windward, so as to be in position to succor the centre, upon which the enemy seemed about to make his chief attack; a judicious order, but rendered fruitless by the purpose of the British to concentrate on the rear itself. When this signal was made, Cadiz was twenty miles distant in the north-north-east, and the course of the allies was carrying them toward it.

Owing to the lightness of the wind Nelson would lose no time in manœuvring. He formed his fleet rapidly in two divisions, each in single column, the simplest and most flexible order of attack, and the one whose regularity is most easily preserved. The simple column, however, unflanked, sacrifices during the critical period of closing the support given by the rear ships to the leader, and draws upon the latter the concentrated fire of the enemy's line. Its use by Nelson on this occasion has been much criticised. It is therefore to be remarked that, although his orders, issued several days previous to the battle, are somewhat ambiguous on this point, their natural meaning seems to indicate the intention, if attacking from to windward, to draw up with his fleet in two columns parallel to the enemy and abreast his rear. Then the column nearest the enemy, the lee, keeping away together, would advance in line against the twelve rear ships; while the weather column, moving forward, would hold in check the remainder of the hostile fleet. In either event, whether attacking in column or in line, the essential feature of his plan was to overpower twelve of the enemy by sixteen British, while the remainder of his force covered this operation. The destruction of the rear was entrusted to the second in command; he himself with a smaller body took charge of the more uncertain duties of the containing force. "The second in command," wrote he in his memorable order, "will, after my instructions are made known to him, have the entire direction of his line."

The justification of Nelson's dispositions for battle at Trafalgar rests therefore primarily upon the sluggish breeze, which would so have delayed formations as to risk the loss of the opportunity. It must also be observed that, although a column of ships does not possess the sustained momentum of a column of men, whose depth and mass combine to drive it through the relatively thin resistance of a line, and so cut the latter in twain, the results nevertheless are closely analogous. The leaders in either case are sacrificed,—success is won over their prostrate forms; but the continued impact upon one part of the enemy's order is essentially a concentration, the issue of which, if long enough maintained, cannot be doubtful. Penetration, severance, and the enveloping of one of the parted fragments, must be the result. So, exactly, it was at Trafalgar. It must also be noted that the rear ships of either column, until they reached the hostile line, swept with their broadsides the sea over which enemy's ships from either flank might try to come to the support of the attacked centre. No such attempt was in fact made from either extremity of the combined fleet.

The Attack at Trafalgar.
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The two British columns were nearly a mile apart and advanced on parallel courses,—heading nearly east, but a little to the northward to allow for the gradual advance in that direction of the hostile fleet. The northern or left-hand column, commonly called the "weather line" because the wind came rather from that side, contained twelve ships, and was led by Nelson himself in the "Victory," a ship of one hundred guns. The "Royal Sovereign," of the same size and carrying Collingwood's flag, headed the right column, of fifteen ships.