The gunboat Tyler, commanded by Lieutenant Gwin, fired from ten minutes to three o'clock until ten minutes to four upon Breckenridge's brigades, and, joined by the Lexington, commanded by Lieutenant Shirk, fired later upon the portion of Bragg's command close to the river-bank, for thirty-five minutes. This fire drove a battery from its position, threw Gibson's brigade and a portion of Trabue's brigade into disorder, killed ten and wounded many of Wood's brigade, killed and wounded a number of Anderson's brigade, and compelled it to seek shelter in a ravine. As the National lines were drifting back toward the landing, Colonel Webster, of General Grant's staff, gathered all the artillery within reach--Major Cavender's six twenty-pounders, Silversparre's twenty-pound Parrotts, and some light batteries--on a commanding position from a quarter to half a mile from the landing. Immediately above the landing a wide and deep ravine opens to the river. For some distance back from the river its bottom was filled with back-water and was impassable. Half a mile back it was still deep, abrupt, and wet, though passable for infantry. Here Colonel Webster gathered from thirty-five to fifty guns. Two of Hurlbut's batteries--Mann's, commanded by Lieutenant Brotzman, and Ross'--had done brilliant service; Brotzman's battery of four pieces had fired off one hundred and ninety-four rounds per gun. Ross' battery was lost in the retreat. Brotzman lost so many horses that he was able to bring off only three guns. These took place in Webster's frowning line. Hurlbut was joined at this position by half of Veatch's brigade, which had been with McClernand through the day, and reformed his division in support of the artillery. General Grant directed him to assume command of all regiments and coherent fragments near. The Forty-eighth Ohio, of Buckland's brigade, being then at the landing, some of W.H. L. Wallace's regiments, that succeeded in breaking through the encircling force, and other detachments, reported to him. Squads of men, separated from their commands, fell in. Hurlbut thus gathered in support of the artillery a force in line which he estimated at four thousand men.