...oughness of the water would permit, and guided by the information obtained, resumed throwing shells, which was continued until near sunset—nearly four hours—with little intermission. Commander O. S. Glisson , in the Mount Vernon, sent two armed boats on the night of December 31, 1861, to destroy a lightship formerly anchored on Frying Pan Shoal, and then secured under the guns of Fort Caswell. No one w...