Notwithstanding these successes, the caricaturists proved a trifle too jubilant. On the 11th of September, a British naval force--consisting of a frigate, a brig, two sloops of war, and some gunboats--attacked the American flotilla before Platsburg, on Lake Champlain, and after a severe conflict were all captured, with the exception of the gun-boats, Captain Downie, the English commander, being killed at the very beginning of the engagement. Sir G. Prevost, in consequence of this disaster, began his retreat, leaving his sick and wounded to the mercy of the enemy. The Americans having now collected from all quarters, the British retired to their lines, and relinquished all idea of penetrating into the State of New York. On the 12th, however, an attempt was made to enter Baltimore, and although in the engagement which followed the American troops were broken and dispersed in the course of fifteen minutes, the victory was dearly purchased by the death of General Ross, while the defensive arrangements of the harbour were so perfect and so formidable, that the attempt was obliged to be given up. Although peace was concluded in the following December, the intelligence unfortunately did not reach the belligerents in time to prevent further mistakes and bloodshed. A series of operations of the British army in the neighbourhood of New Orleans occupied the last week of December and a part of January. An army had been collected for an attack on that town under the command of General Kean, which, with the assistance of Admiral Cochrane, was disembarked without resistance on the 23rd December. On the 25th, General Sir Edward Pakenham arrived and assumed the chief command. On the 27th, the enemy's picquets were driven in within six miles of the town, where their main body was found most strongly posted, and supported by a ship of war moored in such a position as to enfilade the assailants. The result was that the assault of the British was delivered under so withering a fire from every part of the enemy's line, that General Pakenham was killed, Generals Keane and Gibbs wounded, while over 2,000 men and officers were killed, wounded, or made prisoners. Colonel Thornton, indeed, had crossed the river during the previous night and captured a flanking battery of the Americans on the other side; but the report made by him to General Lambert was of so discouraging a character that he decided not to persevere with the attempt, and in the end the whole army re-embarked, leaving a few of the most dangerously wounded behind them, but carrying off all their artillery, ammunition, and stores. The concluding operation of the war was the capture of Fort Mobile, which surrendered to the British on the 11th of February. 1815. ROMEO COATES.