Parker placed under Nelson's immediate command twelve ships of the line and twenty-one smaller vessels, by far the greater part of the British fleet. With these he was to pass to the east of a shoal called the Middle Ground and attack the defences of Copenhagen from the south, while Parker with the remainder of the fleet was to make a demonstration against the more formidable northern defences. The wind could not of course favour both attacks simultaneously, and it was agreed that the attack should be made when the wind favoured Nelson. The nights of the 30th and 31st were spent in reconnoitring and laying buoys. On April 1 a north wind brought Nelson's squadron past the Middle Ground, and on the next day a south wind enabled him to attack the Danish fleet, if fleet it may be called. At the north end of the Danish position stood the only permanent battery, the Trekroner, with two hulks or blockships; the rest consisted of seven blockships and eleven floating batteries, drawn up along the shore. An attack on the south end of the line was also exposed to batteries on the island of Amager. Nelson's intention was to close with the whole Danish fleet, but three of his ships of the line were stranded and he was obliged to leave the assault on the northern end entirely to lighter vessels. [Pageheading: _BATTLE OF THE BALTIC._] The Danish batteries proved more powerful than had been anticipated, and as time went on and the Danish resistance did not appear to lose in strength, Parker grew doubtful of the result of the battle and gave the order to cease action. The order was apparently not intended to be imperative, but it had the effect of inducing Riou, who commanded the frigate squadron, to sail away to the north. For the rest of the fleet obedience was out of the question. Nelson acknowledged, but refused to repeat the order, and, jocularly placing his glass to his blind eye, declared that he could not see the signal. At length the British cannonade told. Fischer, the Danish commander, had had to shift his flag twice, at the second time to the Trekroner, and all the ships south of that battery had either ceased fire or were practically helpless. The Trekroner, however, was still unsubdued and rendered it impossible for Nelson's squadron to retire, in the only direction which the wind would allow, without severe loss. He accordingly sent a message to the Danish Prince Regent, declaring that he would be compelled to burn the batteries he had taken, without saving their crews, unless firing ceased. If a truce were arranged until he could take his prisoners out of the prizes, he was prepared to land the wounded Danes, and burn or remove the prizes. A truce for twenty-four hours was accordingly arranged, which Nelson employed to remove his own fleet unmolested.