By this time the Union army, in readiness for the great fight, was impatient for it to begin. On the 28th sharp skirmishing took place at Wrightsville between the rebels and a small force of Union troops under Colonel Frick. The rebels attacked the Unionists in their rifle-pits, and were fiercely repulsed, until, overpowered by numbers, the Federals fled across the bridge over the Susquehanna river, near Columbia, which they set on fire in order to prevent the rebels from crossing in pursuit of them. On the same day the enemy took possession of the town of York, Pa. From all the cities threatened by the rebels the citizens were rapidly fleeing toward Philadelphia; although a very large number rallied bravely to the defence of their homes. The publication of many newspapers was suspended, the employees having all entered the ranks. The excitement increased every hour. BATTLE OF GETTYSBURG. JULY 1–3, 1863. General Meade, as soon as it was ascertained that the rebels were encamped within full view of Gettysburg, set about making the required changes in the positions of his own troops. On Tuesday, June 30th, General Buford was sent, with a cavalry force numbering six thousand, to make a reconnoissance on the Chambersburg road. They encamped there for the night. Two corps were sent towards the southwest, to a point about four miles from Gettysburg, where they also encamped for the night. These corps were the First, numbering about eight thousand men, under command of General Reynolds; and the Eleventh, numbering nearly fifteen thousand, under command of General Howard. Two corps of the rebel forces, under Generals Hill and Longstreet, and two divisions of Ewell’s corps, were encamped quite near to the town of Gettysburg. The town of Gettysburg, itself, lies at the head of a gently sloping valley, and forms the centre for roads running north, south, east, and west.