Early in the war, Alabamian Raphael Semmes evaluated the South’s naval dilemma of not having a navy to speak of, and advised the use of privateers to prey upon the North’s merchant marine. His record with the CSS Sumter was exemplary, as was the career of the CSS Alabama he later captained. His protocol when capturing Northern commerce was in accordance with the laws of war: “We were making war upon the enemy’s commerce, but not upon unarmed seamen.” Semmes and other Confederate privateers like John Newland Maffitt and John Wilkinson virtually destroyed the North’s merchant marine.
Bernhard Thuersam, www.Circa1865.com
Success of the Confederate Privateers
“The advance [of American merchant ships] continued to 1855, when American steam-shipping amounted to 115,000 tons. From that time a retrograde movement set in, and the steam-tonnage of the United States was less in 1862 than it was seven years before. The civil war which intervened accelerated the decline, and prevented attention from being devoted to the subject, which might possibly have given a different direction to events.
American commerce was, in a measure, driven from the seas by Confederate cruisers and their allies, and American shipping was sold to foreigners on account of the special risks to which its use was subjected. Attention was turned away from ship-building for commercial purposes, and from the fostering of commercial interests in general, and the heavy burdens imposed upon the country in order to raise war revenues had the effect of restricting foreign intercourse and trade.
Accordingly, when the war was over, the American merchant marine was well-nigh destroyed. The wooden sailing vessels had largely disappeared, there had been no increase in steam-tonnage, and the slight revival which followed the return of peace affected the coasting-trade mainly, if not wholly.”
(Merchant Marine of the United States, Appleton’s Annual Cyclopedia, 1882, Appleton & Company, page 522)