New York, Dec. 1. ïlio Tribune has a special Jated Knoxville, Saturday via Cumberland Gap, Monday, saying wo are now in the twelftli day of the siege. The enemy has guiaed no advantage. We are better prepared for attack than the most sanguiue expeeted. Longstreet is delaying for reinforcements from Virginia. - The enemy moved a división Wednesday upon our position over the river, but, after an hour's fight, was clriveu ba(k. - On Tuesday a detachnaent of the Second Michigan, made a gallant charge, and captured a rebel rifle-pit within 500 yards of our works, but subsequently were coiapelled to give way to a superior force, with great loss. Major Byington was taken prisoner, Adjutant Noble and Lieutenant Halpin were killed, and Lieut. Colonel Comstock, Seventeenth Michigan, died Priday, from wounds. It has been cotnparatively quiet for the past tvvo dají. A dispatch from Burnside the 25th of November, says the eueuiy on the 25th moved tliree brigades and attacked his brigade, in strong position, south of the river, three miles from Knoxville. A hard fight followed. ïhe enemy was repulsed with a loss of 150 killed. The position was strengthened, and though the enemy was moving down with a large force with the evident intention of renewing the attaek, Burnside belioved it could be held. He has been able, by usiug roads left open, to keep a supply of provisions and forage. Reiuforcameuts are on the way to hiru. Ieci;tl Dispatcji lu The 'ctruit Kree PresH. Cumberland Gap, Dec. 1. All available forces lcft the Gap today, under the comaiaud of Gen. Foster, with a view of intereepting Longstreet's retreut iuto Virginia. Burnside is said to be closely pushing the enemy's rear. Decisive results are anticipatod. Later- % o'olook P. M. An official couvier has just reached here iroui Kuoxville. The rebels succeeded in throwing a poiitoon bridge aci'oss the river on Sunday, but were prevented from crossing by our batteries commauding the point, resulting in the rout of the eneiny and capture of Whce'.er's entire división of 5,800 troops.