From the Southwest.
Jackson, Miss., Aug. 31.
--A gentleman from Port Hudson reports that the negroes revolted against their Yankee brethren, and that a number of Yankees were killed before the negroes were overcome.
At Baton Rouge a similar emeute took place, in which the Yankees came near being overcome by the "African gentlemen."
[Second Dispatch.]
Jackson, Aug. 31.
--A gentleman of undoubted veracity, just from Vicksburg, says the Yankees sent 3,000 negroes to garrison Richmond, La., when the Confederates made a descent, annihilating the whole command.
A Yankee captain only escaped.
All were killed outright, the Confederates giving no quarter.
The guerillas sank two transports below Natchez ten days ago.
Gen. Price badly defeated the enemy on White river, Ark.