...ispatched to General Cooper, A. and I. G.: General Stevenson reports that eight boats attempted to pass Vicksburg last night; five succeeded in passing, one was burned and sunk, and two disabled. General Chalmers reports sixty-four steamers left Memphis on the fifteenth instant, loaded with troops and negroes, apparently with intention of making an assault on Vicksburg. The enemy has nine (9) boats between ...