Jefferson Davis was not the man to accept this ominous situation without a desperate struggle. The man who had substituted iron gun carriages for wood in the army consulted his Secretary of the Navy on the possibility of revolutionizing the naval-warfare of the world by the construction of an iron-clad ship of first-class power. In his report to the Confederate Naval Committee, Secretary Mallory had developed this possibility two months before the subject had been broached in the report of Gideon Welles in Washington. "I regard the possession of an iron-armored ship," Mallory urged, "as a matter of the first necessity. Such a vessel at this time could traverse the entire coast of the United States, prevent all blockade, and encounter with a fine prospect of success their entire navy. Inequality of numbers may be overcome by invulnerability, and thus not only does economy but naval success dictate the wisdom and expediency of fighting with iron against wood, without regard to first cost." The President of the Confederacy gave his hearty endorsement to this plan--and summoned the genius of the South to the task. At the bottom of the harbor of Norfolk lay the half-burned hull of the steam frigate _Merrimac_ which the Government had set on fire and sunk on destroying the Navy Yard. The _Merrimac_ was raised. A board was appointed to draw plans and estimate the cost of the conversion of the vessel into a powerful, floating, iron-clad battery. In the crippled condition of the Norfolk Navy Yard the task was tremendous and the expense would be great. The President ordered the work prosecuted with the utmost vigor. Day and night the ring of hammers on heavy iron echoed over the quiet harbor of Norfolk. Blacksmiths were forging the most terrible ship of war that ever sailed the seas. If the hopes of her builders should be realized, the navy of the North would be swept from the ocean and the proudest ships of the world be reduced to junk in a day. CHAPTER XXI THE GATHERING CLOUDS Disaster followed disaster for the South now in swift succession. The United States Navy, not content with the supremacy of the high seas, set to work with determination to build a war fleet on the great rivers of the West which could pierce the heart of the lower South. Before the South could possibly secure arms and ammunition with which to equip the army of Albert Sidney Johnston, these gunboats were steaming down the Ohio and Mississippi bearing thousands of troops armed, drilled and led by stark, game-fighting generals from the West. By the end of November the Federal troops threatening Tennessee numbered fifty thousand and they were rapidly reenforced until they aggregated a hundred thousand.