Sir Charles Napier's squadron reached Wingo Sound on the 15th March, and on the 25th it entered the Great Belt, and anchored in Kiel Bay. Soon afterwards, Sir Charles was reinforced by Admiral Corry, with the second division of the fleet. On the 12th of April Sir Charles sailed for the Gulf of Finland, where he established a rigorous blockade. As, even at this season of the year, there is a considerable amount of ice in the Baltic, the navigation of the ships demanded all the vigilance of the officer in charge. Sir Charles, hearing that a Russian squadron, consisting of seven line-of-battle ships and one frigate, was shut up at Helsingfors, made sail in that direction for the purpose of preventing a junction between the two portions of the Russian fleet. In this very important object, in which the enemy's plan of naval operations was completely defeated, he was entirely successful. Admiral Plumridge meantime was scouring the Gulf of Bothnia, and in a short period captured or destroyed forty-six merchantmen and a quantity of naval stores, without losing a man. A SPIRITED ACTION. On the 19th May the _Arrogant_ and the _Hecla_, two steamers--the first a screw, commanded by Captain Yelverton, and the second by Captain Hall--had been detached from the fleet, and employed for a considerable time in reconnoitring the forts of the enemy about Hango Bay. Propulsion by means of a screw was at this time a novelty, the steamships of war being generally large paddle boats and sailing ships combined, a state of transition between the frigate of Nelson's day and the modern steamship. The two captains, hearing that some ships lay off the town of Eckness, some way up a narrow river, determined to cut them out. They boldly entered the river, and on the evening of the 19th came to an anchor. A boat from one of the men-of-war was sent on ahead, but before she had got 800 yards from the ship, a hot fire was opened on her from behind a sandbank in a thickly-wooded place. At the same time some round shot struck the _Hecla_. Both ships instantly beat to quarters, and, casting loose their guns, poured showers of shot and shell into the wood, from whence they speedily dislodged the enemy. They then shifted their berth, and were not further molested during the night. A bright look-out was kept, however, to prevent surprise. At two a.m. both ships weighed, the _Hecla_ leading, and the crews being at their quarters. They slowly and carefully felt their way along the intricate navigation of the river, till they suddenly found themselves within range of the guns of a battery posted on a promontory before them, which was crowded with Russian soldiers--stout-looking fellows, habited in long grey coats and spiked helmets of steel, which glittered brightly in the sun; and the bluejackets now for the first time saw the enemy.