The author provides a rare look at the war fought by primitive northern gunboats drifting through Louisiana's muddy bayous, Yankee merchantmen captured by rebel privateers at sea, and Union ironclads subduing hotly defended Southern forts. Nor does William Fowler neglect the subtler sparrings behind the scenes: War Secretary Stanton and Navy Secretary Welles competing for Lincoln's favor and Welles's fierce duel of strategies with his Confederate counterpart, Stephen Mallory. Finally, the author describes the astonishing transformation of the Navy itself from a ragtag fleet of aging steamers and paddleboats to one of the most powerful waterborne forces in the world.