The bitter animosity of the rebel army was strikingly illustrated on the 23d July, by the destruction of a large number of locomotives and cars of the Baltimore and Ohio railroad by secession troops under the command of Colonel Thomas J. Jackson. Forty-eight locomotives and three hundred cars were blown up or burned, one of the engines having been previously wrapped in our national ensign. The road had been rendered impassable by the destruction of bridges, and, therefore, the rolling stock could not have been rendered available. The estimated loss was about three-quarters of a million of dollars. GENERAL McCLELLAN IN WESTERN VIRGINIA. General McClellan, during the time that elapsed since his appointment, had been actively engaged in organizing his forces and getting them ready for efficient service. Scouting parties—an important feature of his department—were detailed for service, and raw troops replaced by experienced men. Colonel Kelly, who was now recovering from the wounds received at Phillipi, had been appointed by Governor Pierpont to the command of the Virginia brigade of volunteers. Gens. Morris, Hill, Schenck and Schleich were assigned their respective positions—the telegraph lines were put in order, and new ones for military purposes were constructed where necessary. The arrival of fresh regiments, among which Colonel Rosecranz made his appearance, added great activity to the department. On the side of the enemy were Generals Robert S. Garnett, Henry A. Wise, Ex-Governor, John B. Floyd, Ex-Secretary of War, and Colonel Pegram. Columns of Federal troops were dispatched to attack the enemy, simultaneously, at three different points, and the first collision between them occurred on the 10th of July. BATTLE OF SCAREYTOWN.