...atchez, Miss., sent a letter to the Mayor of that city, stating that if the United States boats were fired on by the people of Natchez or by guerrillas, he would bombard the city.--Gold was quoted in Richmond, Va. , at four dollars and twenty-five cents premium. This afternoon Captain Perkins, of the First Louisiana National cavalry, with a party of his men, left Brashear City, La., in order to meet ...