At Culpepper the rebel advance formed a junction with General Stuart’s cavalry; and thence the whole force advanced up the valley of the Shenandoah, in the direction of Winchester. A reconnoissance made toward Culpepper by the Union General Buford, on the 9th of June, resulted in an engagement, in which the Federals lost upwards of three hundred and fifty men, including Colonel B. F. Davis, who had led the cavalry force from Harper’s Ferry, at the time of its surrender in 1862. The enemy’s loss was somewhat larger. Other skirmishes marked the rebel advance. Great excitement resulted from it in Pennsylvania, and generally throughout the North, and measures to check the rebels and to drive them back, were immediately taken by the Government and General Hooker. On the evening of the 14th, and the morning of the 15th, a large body of rebel troops crossed the Potomac in the vicinity of Nolan’s Ford, and moved on Hagerstown, which was evacuated by our troops on the 15th. At nine P. M. on that day, the rebel advance guard entered Chambersburg. On the 16th the rebel advance, consisting mainly of cavalry, was at Chambersburg and Scotland. The forces assembled for the protection of the State were at Shippensburg, Pennsylvania. Two new military departments were organized by the Secretary-of-War on the 9th of June:—that of the Monongahela, and that of the Susquehanna. The former comprised parts of Pennsylvania, Virginia, and Ohio; the latter comprised the whole eastern part of the State of Pennsylvania. Major-General W. T. H. Brooks commanded the one; Major-General D. N. Couch commanded the other. He established his headquarters at Harrisburg, and there took command of the militia, which were called out from the several States, by the President, on the 15th of June. From this date until the battle of Gettysburg, July 3rd, the current of events was marked by frequent alarms, by many disturbances, and continual excitement. Mosby’s guerrillas at this time again appeared in Loudon county, and committed many depredations. The town of McConnelsburg, Pennsylvania, was overrun and pillaged by the rebels on the 19th, and all the bridges on the Baltimore and Ohio railroad, between Harper’s Ferry and Cumberland, which are a hundred miles apart, were destroyed. Hagerstown and Frederick were pillaged, and the rebels took possession of Winchester and Martinsburg. A large portion of the beautiful town of Chambersburg, Pennsylvania, was laid in ashes by the incendiary fires of a relentless foe, in retaliation for the devastation wrought by General Hunter in the Valley of the Shenandoah. The alarm occasioned by all these movements, caused the militia of several states to be called out, and sent to the protection of Pennsylvania. Troops were also raised in that State to the number of twenty-five thousand. The cities of Harrisburg, Baltimore, Pittsburg, and Philadelphia, were fortified. Many of the inhabitants of these cities and of other points