Three gunboats under Lieutenant-Commander S. L. Phelps went up the Tennessee as far as Florence, Alabama, while others proceeded to the mouth of the Cumberland and ascended it to aid the land forces. Commander Phelps on his way up the river seized two steamers, caused six others loaded with supplies to be destroyed, took at Cerro Gordo a half-finished gunboat, and made other important captures of military supplies. He discovered considerable Union sentiment among the inhabitants, some of them voluntarily enlisting to fight the Confederacy.(16) Grant was assigned to the District of West Tennessee February 14, 1862.(17) General Grant had, when he commenced the attack of Fort Donelson, about 15,000 men, in three divisions, commanded, respectively, by Generals C. F. Smith, John A. McClernand, and Lew Wallace. The total force of the enemy was not less than 20,000, under the command of General J. B. Floyd.(18) The investment of the fort commenced on the 12th, but it was not complete until the evening of the 13th, on the arrival of the gunboats and the troops sent by water. Flag Officer Foote opened fire on the enemy's works at 3 P.M. on the 14th, from four gunboats, which continued for an hour and a half with a brilliant prospect of complete success, when each of the two leading boats received disabling shots and were carried back by the current. The other two were soon partially disabled and hence withdrawn from the fight. Grant then concluded to closely invest the fort, partially fortify his lines, and allow time for Commodore Foote to retire, repair his gunboats, and return. But the enemy did not permit this to be done. He drew out from his left the principal part of his effective troops under Generals Gideon J. Pillow, B. R. Johnson, and S. B. Buckner during the night of the 14th, and at early dawn of the 15th assailed, with the purpose of raising the siege or of escaping, the extreme right of Grant's army. A battle of several hours' duration ensued, and for the most part the Confederates gained ground, driving back the Union right upon the centre. Grant was absent in consultation with Commodore Foote (19) when the attack began. Foote was then contemplating a return to Cairo to repair damages, and was likewise wounded.(19) Grant on returning to the battle-ground ordered a counter-attack on the enemy's right by Smith's division, which met with such success as to gain, at the close of the day, possession of parts of the Confederate intrenchments. After Smith's charge had commenced, McClernand and Wallace were ordered to assume the offensive on the enemy's left flank, which resulted in driving the Confederates back to the works from whence they had emerged in the morning. Preparation was then made for an assault all along the line early next morning. Consternation and demoralization prevailed in the Confederate camps during the night, especially at headquarters.