Just in rear of the rifle-pits occupied by the Thirty-sixth Massachusetts was an elegant brick mansion, of recent construction, known as the Powell House. When the siege commenced, fresco-painters were at work ornamenting its parlors and halls. Throwing open its doors, Mr. Powell, a true Union man, invited Colonel Morrison and Major Draper to make it their head-quarters. He also designated a chamber for the sick of our regiment. Early during the siege, the southwestern and northwestern fronts were loopholed by order of General Burnside, and instructions were given to post in the house, in case of an attack, two companies of the Thirty-sixth Massachusetts. When the order was announced to Mr. Powell, he nobly said, "Lay this house level with the ground, if it is necessary." A few feet from the southwestern front of the house, a small earthwork was thrown up by our men, in which was placed a section of Buckley's battery. This work was afterwards known as Battery Noble. Morrison's brigade now held the line of defences from the Holston River--the extreme left of our line--to Fort Sanders. The following was the position of the several regiments of the brigade. The Forty-fifth Pennsylvania was on the left, its left on the river. On its right lay the Thirty-sixth Massachusetts. Then came the Eighth Michigan. The Seventy-ninth New York (Highlanders) formed the garrison of Fort Sanders. Between the Eighth Michigan and Fort Sanders was the One Hundredth Pennsylvania (Roundheads). On the evening of the 20th, the Seventeenth Michigan made a sortie, and drove the Rebels from the Armstrong House. This stood on the Kingston road, and only a short distance from Fort Sanders. It was a brick house, and afforded a near and safe position for the enemy's sharpshooters, which of late had become somewhat annoying to the working parties at the fort. Our men destroyed the house, and then withdrew. The loss on our part was slight. For a few days during the siege, four companies of the Thirty-sixth Massachusetts were detached to support Roemer's battery on College Hill. While on this duty the officers and men were quartered in the buildings of East Tennessee College. Prior to our occupation of East Tennessee, these buildings had been used by the Rebels as a hospital; but, after a vigorous use of the ordinary means of purification, they afforded us pleasant and comfortable quarters. The siege had now continued several days. The Rebels had constructed works offensive and defensive in our front; but the greater part of their force seemed to have moved to the right. On the 22d of November, however, they returned, not having found evidently the weak place in our lines which they had sought. It was now thought they might attack our front that night; and orders were given to the men on duty in the outer works to exercise the utmost vigilance. But the night passed quietly.