The fleet sailed from Yarmouth on March 12, and fought its way through fierce spring gales to the entrance of the Kattegat. The wind was fair; Nelson was eager to sweep down on Copenhagen with the whole fleet, and negotiate with the whole skyline of Copenhagen crowded with British topsails. "While the negotiation is going on," he said, "the Dane should see our flag waving every time he lifts up his head." Time was worth more than gold; it was worth brave men's lives. The Danes were toiling day and night to prepare the defence of their capital. But prim Sir Hyde anchored, and sent up a single frigate with his ultimatum, and it was not until March 30 that the British fleet, a long line of stately vessels, came sailing up the Sound, passed Elsinore, and cast anchor fifteen miles from Copenhagen. Nothing could surpass the gallant energy shown by the Danes in their preparation for defence, and Nature had done much to make the city impregnable from the sea. [Illustration: The Battle of the Baltic, April 2nd, 1801. From Brenton's Naval History.] The Sound is narrow and shallow, a mere tangle of shoals wrinkled with twisted channels and scoured by the swift tides. King's Channel runs straight up towards the city, but a huge sandbank, like the point of a toe, splits the channel into two just as it reaches the harbour. The western edge runs up, pocket-shaped, into the city, and forms the actual port; the main channel contracts, swings round to the south-east, and forms a narrow passage between the shallows in front of the city and a huge shoal called the Middle Ground. A cluster of grim and heavily armed fortifications called the Three-Crown Batteries guarded the entrance to the harbour, and looked right up King's Channel; a stretch of floating batteries and line-of-battle ships, a mile and a half in extent, ran from the Three-Crown Batteries along the edge of the shoals in front of the city, with some heavy pile batteries at its termination. The direct approach up King's Channel, together with the narrow passage between the city and the Middle Ground, were thus commanded by the fire of over 600 heavy guns. The Danes had removed the buoys that marked all the channels, the British had no charts, and only the most daring and skilful seamanship could bring the great ships of the British fleet through that treacherous tangle of shoals to the Danish front. As a matter of fact, the heavier ships in the British fleet never attempted to join in the desperate fight which was waged, but hung as mere spectators in the offing.