Knoxville at this time was by no means in a defensible condition. The bastion-work, occupied by Benjamin's and Buckley's batteries, was not only not finished, but was little more than begun. It required two hundred negroes four hours to clear places for the guns. There was also a fort in process of construction on Temperance Hill. Nothing more had been done. But the work was now carried forward in earnest. As fast as the troops were placed in position, they commenced the construction of rifle-pits. Though wearied by three days of constant marching and fighting, they gave themselves to the work with all the energy of fresh men. Citizens and contrabands also were pressed into the service. Many of the former were loyal men, and devoted themselves to their tasks with a zeal which evinced the interest they felt in making good the defence of the town; but some of them were bitter Rebels, and, as Captain Poe, Chief-Engineer of the Army of the Ohio, well remarked, "worked with a very poor grace, which blistered hands did not tend to improve." The contrabands engaged in the work with that heartiness which, during the war, characterized their labors in our service. At noon, the enemy's advance was only a mile or two distant; and four companies of the Thirty-sixth Massachusetts--A, B, D, G--were thrown out as skirmishers,--the line extending from the Holston River to the Kingston road. But the enemy was held in check at some little distance from the town by Sanders's division of cavalry. The hours thus gained for our work in the trenches were precious hours, indeed. There was a lack of intrenching tools, and much remained to be done; but all day and all night the men continued their labors undisturbed; and, on the morning of the 18th, our line of works around the town presented a formidable appearance. Throughout the forenoon of that day there was heavy skirmishing on the Kingston road; but our men--dismounted cavalry--still maintained their position. Later in the day, however, the enemy brought up a battery, which, opening a heavy fire, soon compelled our men to fall back. The Rebels, now pressing forward, gained the ridge for which they had been contending, and established their lines within rifle range of our works. It was while endeavoring to check this advance that General Sanders was mortally wounded. He was at once borne from the field, and carried into Knoxville. While a surgeon was examining the wound, he asked, "Tell me, Doctor, is my wound mortal?" Tenderly the surgeon replied, "Sanders, it is a fearful wound, and mortal. I am sorry to say it, my dear fellow, but the odds are against you." Calmly the General continued, "Well, I am not afraid to die. I have made up my mind upon that subject. I have done my duty, and have served my country as well as I could." The next day he called the attention of the surgeon to certain symptoms which he had observed, and asked him what they meant. The surgeon replied, "General, you are dying."