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A major function of the Union Navy against the Confederacy was Ironclad ships . The Confederacy made the first ironclad ship (named the Virginia , but originally called the Merrimac) . It had destroyed the Congresss and the Cumberland on March 8, 1862 . Then the Union sent out its first ironclad , named the Moniter to defend the Minnesota . When the ships met , the Merrimac damaged the Moniter , but the Minnesota didn't get sunk . Many people argue who won the battle , because the Monitorwas damaged but the Merrimac didn't sink the Minnesota . The Union had 31 ironclads at the end of the war and they were huge advantages because the were made of steel .

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15y ago

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