While the West in 1861–62 was alive with marching armies and the sound of strife, the East had been experiencing its share of activity by land and sea, and the navy must first engage us. The blockade became steadily more effective as new ships, purchased, chartered, or built for the purpose, gathered at the various rendezvous. Hatteras Inlet and Port Royal, seized in the fall of 1861,[216] became bases for coast and inland expeditions which narrowed the Confederate hold on the shore of the Atlantic. In January, 1862, a fleet and army, braving the mid-winter storms which were more formidable than human opposition, entered by Hatteras Inlet, in order to dominate more completely the North Carolina sounds. The fortifications on Roanoke Island, lying between Albemarle and Pamlico sounds, were easily captured, February 8th. New-Berne and other towns were soon after occupied, and the inlets and river-mouths so occupied and threatened that the outlets to the sea became for the Confederates few and perilous. This successful course was interrupted during the Virginia campaign of the summer; the troops were to a large extent withdrawn to places where reinforcements were demanded. The Roanoke Island expedition is noteworthy, among other reasons, for bringing to the front Ambrose E. Burnside, its commander,[217] a brave and well-intentioned patriot, quite inadequate, however, for large responsibilities, which later came upon him. During these same weeks forces farther south were equally busy in expeditions from Port Royal. Fort Pulaski, the strong work which commanded the approaches to Savannah, a post environed by swamps and watercourses, and therefore difficult of access, succumbed rather to the engineering skill than to the bravery of its assailants, April 11, 1862; therefore, most of the littoral of Georgia, in addition to that of North and South Carolina, was in Federal hands.[218] These conquests were presently supplemented by the occupation of the Atlantic ports of Florida. On the Gulf side, the retention of Fort Pickens by Union forces from the beginning had put Pensacola Harbor under Federal control. The blockade, at first deemed impracticable, within a year of its establishment was throttling the foreign commerce which was vital to the Confederacy. On the Atlantic scarcely any important ports were left except Charleston and Wilmington; and before the thresholds of these places lay, night and day, the fierce and watchful war-dogs of the Union.[219] Nevertheless, up to April, 1862, the Gulf ports of Mobile, New Orleans, Galveston, and Matagorda still remained to the Confederacy. How long could these maintain themselves?