At three A.M. having got the Dictator, Calypso, and prize brigs in the fair way, we attempted to get out through the passage, when we were assailed by a division of gun-boats from behind the rocks, so situated that not a gun could be brought to bear on them from either vessel. In this situation the prize brigs grounded, and notwithstanding every exertion on the part of Lieut. James Wilkie of this ship, who was on board the Laaland, and had extinguished a fire on board her, which was burning with great fury, and Lieut. Hooper of the Calypso, in the Kiel, we had to abandon them complete wrecks, humanity forbidding us setting them on fire, owing to the number of wounded men they had on board. Captain Stewart's letter concludes with the highest praise on all the officers and men in the squadron he commanded, and subjoins a list of nine men killed, and thirty-seven wounded and missing. The enemy admitted that they had lost three hundred men, but it was supposed that five hundred was nearer the number. We are sorry to record that some of the Danish officers violated their parole and treacherously rose on their protectors, after medical aid had been afforded them under the sacred sanction of a flag-of-truce! Sir James enclosed Captain Stewart's narrative in the following letter to the Secretary of the Admiralty: SIR,--I have the highest satisfaction in transmitting to you, to be laid before the Lords Commissioners of the Admiralty, the inclosed letter, which I have this day received from Captain Stewart, of H.M.S. Dictator, detailing the particulars of a most gallant exploit, performed by him and the two sloops and the gun-brig named on the margin (Podargus, Calypso, and Flamer,) upon the Danish frigate Nayaden, three large sloops of war, and numerous gun-boats, within the Rocks of Wardoe, on the coast of Norway, supported by batteries on the shore; in which the enemy's frigate has been totally destroyed, and the sloops of war completely disabled, besides several of the gun-boats sunk. It is impossible to express in an adequate manner the undaunted spirit displayed by Captain Stewart, and all the officers and men under his orders, in this arduous enterprise, which, I am assured, will be duly appreciated by their Lordships. Captain Stewart speaks in the strongest terms of the gallantry and zeal of Captain Robilliard, of the Podargus; Captain Weir, of the Calypso; and Lieut. Thomas England, of the Flamer gun-brig; he also recommends Lieut. Buchanan, first of the Dictator, to their Lordships' favourable notice. I have, &c. &c. &c. JAMES SAUMAREZ. J.W. Croker, Esq.