From the Southwest.
Mobile, December 6.
--A special dispatch, dated Saltillo, 5th inst, says: ‘
"The report of the enemy advancing down the Mobile and Ohio Railroad, on this place, is without foundation.
Our pickets were not fired upon, as reported, and there is no enemy nearer than Corinth.
Paroled prisoners state that Corinth is garrisoned by 2,000 troops.
Only 200 of our wounded are now remaining at luka. ’
[second Dispatch.]
Mobile, Dec. 7.
--The Tribune learns that the enemy's force which approached Grenada was a portion of Gen. Curtis's command, numbering 1,500 cavalry, 1,500 infantry, and a section of artillery.--They came from Helena, and halted within three miles of Grenada, and there was no Confederate force to meet them; but the people rushed to arms, and by courage and judicious bush whacking, drove them back to Judge Fisher's plantation, ten miles from Grenade, where they made a stand, and commenced throwing up fortifications.
They heavy rains, and almost impassable roads, it is supposed, would render their retreat impossible, and that the Confederates, by a quick movement, may bag them.
The Yankees destroyed the railroad bridge three miles from Grenade. 