On Thursday, General Richardson's brigade of General McDowell's army had a skirmish with General Longstreet's brigade at Blackburn's Ford, which the Rebels call the battle of Bull Run, while that which was fought on the 21st they call the battle of Manassas. General Beauregard expected that the attack would be renewed along the fords, and posted his men accordingly. Going down to the railroad bridge, we see General Ewell's brigade of the Rebel army on the western bank guarding the crossing. General Jones's brigade is at McLean's Ford. At Blackburn's Ford is General Longstreet's, and at Mitchell's Ford is General Bonham's. Near by Bonham's is General Earley's, General Bartow's, and General Holmes's. General Jackson's is in rear of General Bonham's. At Island Ford is General Bee and Colonel Hampton's legion, also Stuart's cavalry. At Ball's Ford is General Cocke's brigade. Above, at the Stone Bridge, is the extreme left of the Rebel army, General Evans's brigade. General Elzey's brigade of the Shenandoah army is on its way in the cars, and is expected to reach the battle-field before the contest closes. General Johnston has between fifty and sixty pieces of artillery and about one thousand cavalry. General McDowell had also about thirty thousand men and forty-nine pieces of artillery. His army was in four divisions,--General Tyler's, General Hunter's, General Heintzelman's, and General Miles's. One brigade of General Tyler's and General Miles's division was left at Centreville to make a feint of attacking the enemy at Blackburn's and Mitchell's Fords, and to protect the rear of the army from an attack by Generals Ewell and Jones. The other divisions of the army--five brigades, numbering eighteen thousand men, with thirty-six cannon--marched soon after midnight, to be ready to make the attack by sunrise on Sunday morning. General Tyler, with General Keyes's brigade, General Sherman's, and General Schenck's, marched down the turnpike towards the Stone Bridge, where General Evans was on the watch. General Tyler had twelve pieces of artillery,--two batteries, commanded by Ayer and Carlisle. It is sunrise as they approach the bridge,--a calm, peaceful Sabbath morning. The troops leave the turnpike, march into a cornfield, and ascend a hill overlooking the bridge. As you stand there amid the tasselled stalks, you see the stream rippling beneath the stone arches, and upon the other bank breastworks of earth and fallen trees. Half hid beneath the oaks and pines are the Rebel regiments, their gun-barrels and bayonets flashing in the morning light. Beyond the breastworks upon the knolls are the farm-houses of Mr. Lewis and Mrs. Henry.