Next morning, Thursday the 13th, arrived, and the fleet had not come. Fifteen thousand men, without supplies, confronted 20,000 well intrenched. A party was sent to destroy the railroad bridge over the Tennessee, above Fort Henry, the trestle approach to which had been partly destroyed by Lieutenant-Commander Phelps, to prevent effectually reinforcements reaching Donelson from Columbus. Order was sent to General Lewis Wallace, who had been left with a brigade in command at Fort Henry, to join the besieging force. The two divisions on the ground prosecuted the work of feeling for position and probing the enemy. Colonel Lauman's brigade, of C.F. Smith's division, bivouacked the night of the 12th, about a mile from the intrenchments. On the 13th he moved over the intervening ridges till he came in view of the portion of the works held by Colonel Hanson, constituting the right of General Buckner's line. A deep hollow filled with timber filled the space between Lauman and the works before him. On the farther slope, crowned by the works, the slashed timber made an extensive abattis. Colonel Veatch, with the Twenty-fifth Indiana, advanced across the ravine or hollow, and forced his way partly up the slope. He remained with his command two hours exposed to a fire to which, from their position, they could make no effectual reply, and were recalled. The Seventh and Fourteenth Iowa moved up to the left of the position reached by Colonel Veatch, and a detachment of sharpshooters was posted so as to reach with their fire the men in the trenches and divert their fire. At night Lauman withdrew his command to the place of the previous night's bivouac. Colonel Cook's brigade advanced, the morning of the 13th, on the right of Lauman's. The left of his line came also in front of Hanson's works. The valley was here filled with such an "immensity of abattis" that he did not feel justified in ordering an attempt to cross it, but kept up through the day a desultory fire of skirmishers and sharpshooters over it. The demonstration made by Lauman and Cook appeared so threatening that General Buckner sent the Eighteenth Tennessee to reinforce Hanson. The Seventh Illinois, which constituted the right of Cook's advance moving through the timber where a ridge leads to a battery at a salient in General Buckner's line, suddenly found itself under fire and retired. Colonel Cook formed his line with the other four regiments upon a ridge overlooking the enemy's intrenchments, about six hundred yards from them, separated from them by a valley dense with timber, mostly cut so as to form abattis, and remained in this position for the night.