During the siege of Vicksburg a daring raid was made in the rear of the city by Colonel B.H. Grierson. In this instance his work was of great help to General Grant, for he destroyed the Confederate lines of communication, and checked the gathering of reinforcements for Pemberton. Grierson, who conceived the plan of the raid, left La Grange on the 17th of April with three regiments of cavalry. After crossing the Tallahatchie, he rode south to the Macon and Corinth Railroad, where the rails were torn up, telegraph lines cut, and bridges and other property destroyed. To do the work thoroughly detachments were sent in different directions, and they spared nothing. Grierson now changed his course to the southwest, seized the bridge over Pearl River, burned a large number of locomotives, and forced his way through a wild country to Baton Rouge, which he found in the possession of Unionists. He had been engaged for a fortnight on his raid, during which he destroyed an immense amount of property, captured several towns, fought several sharp skirmishes, and carried off many prisoners. John S. Mosby was the most daring Confederate raider in the East. Some of his exploits and escapes were remarkable, and an account of them would fill a volume with thrilling incidents. General Lee did not look with favor on such irregular work, but accepted it as one of the accompaniments of war, and it cannot be denied that Mosby gave him valuable help in more than one instance. MORGAN'S RAID. John H. Morgan was famous in the southwest as a raider and guerrilla. At the beginning of July, 1863, he seized Columbia, near Jamestown, Kentucky, and advanced against Colonel Moore at Greenbrier Bridge. His reception was so hot that he was obliged to retreat, whereupon he attacked Lebanon, where there was considerable vicious fighting in the streets. One of Morgan's regiments was commanded by his brother, who was killed. The incensed leader set fire to the houses, and, although the defenders surrendered, the place was sacked. Then the invaders retreated before the Union cavalry who were advancing against them. Their course was through Northern Kentucky, where they plundered right and left, and spread dismay on every hand. Reckless and encouraged by their successes, they now swam their horses over the Ohio River, and, entering Indiana, gave that State its first experience in war. The local militia were called out, but the experienced cavalry easily brushed them aside. They knew, however, it would be different when they met the regular Union cavalry who were riding hard after them. To escape them, Morgan started for western Virginia. When he entered Ohio, the State was terrified, and even Cincinnati trembled, but the raiders had no thought of stopping until they readied western Virginia, where they would be safe.