From the point of view just described, where the road falls gently down to a ravine, the enemy first appeared. A line of infantry was drawn up in a distant meadow, close upon a back-ground of woods. The second and third regiments of Tyler’s brigade, under Schenck, was at once formed into line in the woods on either side, the First Ohio, Second Wisconsin, Seventy-ninth, Thirteenth, and Sixty-ninth New York regiments succeeding each other on the right, and the Second Ohio and Second New York being similarly placed on the left, while the artillery came down the road between. A great 32-pound rifled Parrott gun—the only one of its calibre in the field service—was brought forward, and made to bear on the point where the bayonets of the enemy had suddenly disappeared in the woods, and a shell was fired at fifteen minutes past six A. M., which burst in the air; but the report of the piece awoke the country for leagues around to a sense of what that awful day would prove. The reverberation was tremendous, and the roar of the revolving shell indescribable. Throughout the battle that gun, whenever it was fired, seemed to hush and overpower everything else. No answering salute came back, so the 32-pounder sent a second shell at a hill-top, two miles off, where it was suspected that a battery had been planted by the rebels. The bomb burst close at the intended point, but no answer came. General Tyler ordered Carlisle to cease firing, and bring the rest of his battery to the front of the woods and get the column ready for instant action. Tyler’s position was before the valley of Bull Run, but the descent was gradual, and surrounded by thick woods down almost to the ravine through which the stream flows. The enemy, on the contrary, had cleared away all the obstructing foliage, and bared the earth in every direction over which they could bring their artillery upon the Union forces. Clumps of trees and bushes remained wherever their earthworks and other concealed defences could be advantageously planted among them. The ground on their side was vastly superior to that of the assailants. It rose in gradual slopes to great heights, but was broken into hills and terraces in many places, upon which strong earthworks were planted, some openly, but the greater portion concealed. Nature had supplied positions of defence which needed but little labor to render them desperately formidable. How thoroughly these advantages had been improved was established by the almost superhuman efforts which were required to dislodge their troops, and by the obstinate opposition which they displayed before retiring from one strong point to another. It was now about seven o’clock—for an hour everything was silent. At eight, the deep sullen boom of Richardson’s and Davies’ batteries at Blackburn’s Ford broke the stillness, and from that quarter constant cannonading was kept up for some time.