SIR, I have received and laid before my Lords Commissioners of the Admiralty your letter of the 10th instant, transmitting a report from Captain Ross, of the Briseis, of the re-capture of the merchant ship Urania, in Pillaw Roads, by the boats of that sloop, under the orders of Lieutenant Jones and Mr. Palmer, midshipman, and I am in reply commanded to express their Lordships' approbation of the gallantry displayed by the officers and men on this service. There can be no doubt but promotion would have followed this valiant and successful affair, but Lieut. Jones being unfortunately obliged to return home in consequence of pressing family affairs, and having not rejoined his ship, lost his well-merited advancement in the navy, while Mr. Palmer obtained his promotion. The Briseis was subsequently appointed to carry the joyful news of peace to Libau, where Captain Ross was received with demonstrations of joy. The hatred the oppressed inhabitants manifested towards their oppressors the French, who had just vacated the place, was beyond expression; and a Russian squadron had now ventured out of the Gulf of Finland to join in the general rejoicing. Steps were taken by the Admiral to remove the supplies of corn and provisions at that place, to prevent their falling into the hands of the advancing enemy. Rear-admiral (now Admiral Sir Byam Martin, G.C.B.) was detached in the Aboukir, his flag-ship, and a numerous squadron and flotilla, to assist in the defence of Riga, which, as soon as war was declared, would be exposed to the attack of Macdonald's and Oudinot's divisions of the French army. In the mean time, peace between Great Britain and Russia took place on the 18th July, and this happy event was announced to the Admiral in the following letter from Mr. Thornton, General Suchtalen having previously arrived in Sweden with full powers from the Emperor of Russia. Orebro, 17th July 1812. SIR, I have the honour of informing your excellency that I have this day signed a treaty of peace with the Swedish and Russian plenipotentiaries, and you will receive under this cover a packet containing those for his Majesty's principal Secretary of State for Foreign Affairs, which I will request your excellency to deliver to the care of a confidential officer, to be conveyed to England. Should you think that the King's service will not be promoted by detaching a vessel of war with him, I see no impropriety in the officer's sailing in the packet-boat and making the best of his way to England.