Napoleon had kept the secret of his Egyptian expedition well, and the great Toulon fleet, with its swarm of transports, had vanished round the coast of Corsica and gone off into mere space, as far as a bewildered British Admiralty knew. A fleet of thirteen 74-gun ships and one of 50 guns was placed under Nelson's flag. He was ordered to pursue and destroy the vanished French fleet, and with characteristic energy he set out on one of the most dramatic sea-chases known to history. With the instinct of genius he guessed that Napoleon's destination was Egypt; but while the French fleet coasted Sardinia and went to the west of Sicily, Nelson ran down the Italian coast to Naples, called there for information, found none, and, carrying all sail, swept through the straits of Messina.

On the night of June 22 the two fleets actually crossed each other's tracks. The French fleet, including the transports, numbered 572 vessels, and their lights, it might be imagined, would have lit up many leagues of sea. Yet, through this forest of hostile masts the English fleet, with keen eyes watching at every masthead, swept and saw nothing. Nelson, for one thing, had no frigates to serve as eyes and ears for him; his fleet in sailor-like fashion formed a compact body, three parallel lines of phantom-like pyramids of canvas sweeping in the darkness across the floor of the sea. Above all a haze filled the night; and it is not too much to say that the drifting grey vapour which hid the French ships from Nelson's lookout men changed the face of history.

Nelson used to explain that his ideal of perfect enjoyment would be to have the chance of "trying Bonaparte on a wind"; and if he had caught sound of bell or gleam of lantern from the great French fleet, and brought it to action in the darkness of that foggy night, can any one doubt what the result would have been? Nelson would have done off the coast of Sicily on June 22, 1798, what Wellington did on June 18, 1815; and in that case there would have been no Marengo or Austerlitz, no retreat from Moscow, no Peninsular war, and no Waterloo. For so much, in distracted human affairs, may a patch of drifting vapour count!

Nelson, in a word, overran his prey. He reached Alexandria to find the coast empty; doubled back to Sicily, zigzagging on his way by Cyprus and Candia; and twelve hours after he had left Alexandria the topsails of the French fleet hove in sight from that port. Napoleon's troops were safely landed, and the French admiral had some four weeks in which to prepare for Nelson's return, and at 3 P.M. on August 1 the gliding topsails of the Swiftsure above Aboukir Island showed that the tireless Englishman had, after nearly three months of pursuit, overtaken his enemy.

The French, if frigates be included, counted seventeen ships to fourteen, and ship for ship they had the advantage over the British alike in crew, tonnage, and weight of fire. In size the English ships scarcely averaged 1500 tons; the French ships exceeded 2000 tons. Nelson had only seventy-fours, his heaviest gun being a 32-pounder. The average French 80-gun ship in every detail of fighting strength exceeded an English ninety-eight, and Bruéys had three such ships in his fleet; while his own flagship, the Orient, was fully equal to two English seventy-fours. Its weight of ball on the lower deck alone exceeded that from the whole broadside of the Bellerophon, the ship that engaged it. The French, in brief, had an advantage in guns of about twenty per cent., and in men of over thirty per cent. Bruéys, moreover, was lying in a carefully chosen position in a dangerous bay, of which his enemies possessed no chart, and the head of his line was protected by a powerful shore battery.

Nothing in this great fight is more dramatic than the swiftness and vehemence of Nelson's attack. He simply leaped upon his enemy at sight. Four of his ships were miles off in the offing, but Nelson did not wait for them. In the long pursuit he had assembled his captains repeatedly in his cabin, and discussed every possible manner of attacking the French fleet. If he found the fleet as he guessed, drawn up in battle-line close in-shore and anchored, his plan was to place one of his ships on the bows, another on the quarter, of each French ship in succession.

It has been debated who actually evolved the idea of rounding the head of the French line and attacking on both faces. One version is that Foley, in the Goliath, who led the British line, owed the suggestion to a keen-eyed middy who pointed out that the anchor buoy of the headmost French ship was at such a distance from the ship itself as to prove there was room to pass. But the weight of evidence seems to prove that Nelson himself, as he rounded Aboukir Island, and scanned with fierce and questioning vision Bruéys' formation, with that swiftness of glance in which he almost rivalled Napoleon, saw his chance in the gap between the leading French ship and the shore. "Where a French ship can swing," he held, "an English ship can either sail or anchor." And he determined to double on the French line and attack on both faces at once. He explained his plan to Berry, his captain, who in his delight exclaimed, "If we succeed, what will the world say?" "There is no 'if' in the case," said Nelson; "that we shall succeed is certain; who will live to tell the story is a very different question."

[Illustration: THE BATTLE OF THE NILE.
Doubling on the French Line.
From Allen's "Battles of the British Navy.">[