Moreover a close blockade was simply impossible. Not one ship in a dozen that attempted to pass out or in, was in actual fact captured or driven ashore. The number of ships engaged in blockade running was steadily reduced by the increasing dangers encountered, but the traffic continued, with no effective interruption, until near the end of the war, the chief effect of the blockade being to increase the profits of the English shipowners and shipmasters who engaged in the perilous commerce and enormously to enhance the market value of goods of every kind at the South. An ounce of quinine that cost $2.80 in Nassau was worth $1,100 or $1,200 in Charleston, while the Confederate money received for the quinine would buy cotton at ten cents a pound which had a value at the very least of half a dollar a pound in gold at Nassau. On such terms the human instinct of gain made it certain that the blockade, however legally effective it might be made, would be broken through by daring shipmasters so long as the war should last and precisely that is what in fact happened. But in aid of the blockade, and in aid of the general policy of shutting the South in and compelling it to rely exclusively upon its own inadequate resources, the Federal Government promptly dispatched forces to the South, to capture the seacoast fortifications there and to make of the coast a Federal instead of a Confederate possession and stronghold. On the twenty-ninth of August, 1861, an expedition under command of General B. F. Butler, captured the forts at Cape Hatteras. On the seventh and eighth of November another expedition reduced the works at Port Royal and Hilton Head in South Carolina, thus making of the coast strongholds important strategic positions for the Northern arms. Later the whole coast, except the great harbor, was conquered. It must always be a matter of astonishment to the historian that greater use was not made of the advantages thus gained at the beginning of the war. It is true that the geography of the Carolinian coast country specially lent itself to the defense of that region by small forces arrayed against greatly superior numbers. It is true, for example, that at Pocotatigo, on the twenty-second of October, 1862, two batteries of artillery and a company or two of dismounted cavalry numbering in all only 350 men, being reinforced late in the day by about four hundred more, succeeded in repelling the all-day assault of not less than three thousand and ended by driving the Federal force back to its ships. This was due in part to the peculiarly defensive nature of the ground and in part to the certainty that the Federal forces could not remain over night at Pocotatigo without finding nearly every man among them stricken with that dire disease, "country fever," before morning.