...rtification. Fort Moultrie, batteries Bee and Beauregard, on Sullivan's Island, opened briskly with their heavy guns on the monitors; battery Gregg also keeping up a constant and vigorous fire from Cummings's Point . In about half an hour one of the monitors left, it is believed badly damaged. The engagement was continued by the others until four o'clock, when they also hauled off, batteries Gregg and Wagner...