Fort Sumter itself was by this time so utterly ruined that no further damage could be done to it by continued firing, in rendering it useless as a defence to Charleston; and as it was not deemed necessary to absolutely level it with the earth, firing upon it was discontinued after the 23d August. Fort Wagner was found to be very difficult to overcome. Day after day the bombardment had been continued against the place, which was evidently one of the strongest of the enemy’s forts. It was commanded by Colonel Keith, of South Carolina, and garrisoned by fourteen hundred effective men; but notwithstanding its brave defence and its strength, it could not much longer hold out against the Union forces. On the 26th General Gilmore succeeded in running a parallel very close to Wagner. A ridge of sand which interposed, could, he perceived, be made useful, as it was constantly occupied by a body of the enemy’s pickets, and at night by a large force protected by rifle-pits. To push the rebels from this sand ridge and take possession of it himself was the intention of General Gilmore; and just before dark the position was assaulted, and carried by the Twenty-fourth Massachusetts regiment. The bombardment of the fort itself then continued more actively than ever, while from Fort Johnson and all the other works on James island, the booming of cannon continued to make itself heard loud and furious. On the 30th of August the bombardment of Fort Sumter was resumed. For seven days the firing had ceased against it, but as that was quite long enough for the enemy to make necessary repairs, and in some degree fit it up again, firing was recommenced in order to prevent the rebels from making any important advance in their work of reconstruction, supposing them to have begun it. No reply came from the fort in answer to the firing directed against it, which only increased its battered and helpless appearance. On September 1st a general engagement took place between Forts Wagner, Moultrie, and Sumter, and the Union iron-clads, in which two of the forts suffered severely, but the apparently invincible Wagner was but slightly injured. To mine the work was impossible, because of its low position. The men who attempted to lay a train, discovered water at the depth of only two feet. But the sappers succeeded, on the night of the 6th September, in mining the outerscrap, after long and tedious work; and in this way all its guns were unmasked, and an order was issued to carry the place by assault at nine o’clock on the following morning, that being the hour of low tide. It was then discovered that the enemy had commenced evacuating the fort late on the previous night, and with the exception of seventy-five men, had escaped. The National troops invested the fort, and took possession of Cummings’ point. A large supply of excellent ammunition was captured, and nineteen pieces of artillery; and thus the city and harbor of Charleston were completely covered by the Union guns.