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The War in the West, 1861–1862
is also  credited with building the  first military submarine, 
the H.C. Hunley. It was only used once during the war. On 
the night of February 17, 1864, the eight-man crew of the 
cigar-shaped iron submersible torpedoed a Union blockade 
vessel off the coast of Charleston Harbor. The Hunley never 
returned from the attack, lost at sea, along with its crew. The 
wreck of the Hunley was rediscovered on the floor of the har-
bor in 2000 and has been recovered for museum display.
One of the most innovative technologies of the war was 
the development of an entirely new kind of surface vessel—
the ironclad. In an age when ships were wooden sailing ves-
sels,  the  ironclads  redefined  the  art  of  naval  warfare.  The 
first was Southern made. In 1861, as the North abandoned 
the naval yard at Norfolk, Virginia, they scuttled a wooden 
steam frigate, the Merrimack, to keep it out of the hands of 
the  Rebels.  Confederates  later  raised  the  sunken  ship  and 
bolted iron plates over its hull, creating a new kind of vessel, 
one  capable  of  withstanding  a  naval  cannon  barrage.  Ear-
lier  wooden  sailing  ships  designed  for  warfare  had  some-
times had portions of their hulls sheathed in copper, both 
for defense and to  protect the wood  from shipworms,  but 
never the  entire ship. Southerners rechristened their rede-
signed dreadnought the CSS Virginia.
The North did not intend to be outdone at sea, however. 
The first Union ironclad, though, was not constructed from 
an existing wooden ship. It was invented from the ground 
up by a Swedish immigrant, John Ericsson, who had done 
work for the U.S. Navy before the war. Working out of New 
York City, Ericsson designed an odd-looking craft that was 
made entirely of iron and sat low and flat in the water. The 
most innovative feature was its revolving iron turret, which 
allowed its two guns to fire in any direction. Ericsson built 
his ship, the Monitor, in just four months, since the Virginia 
was  already  in  existence.  There  were  plenty  of  problems, 
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