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Viking used long boats aligned with their shield for protection
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Turtle boats were used in the 1500 and they were thought to be the very first ironclads
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In 1813 Thomas Gregg of Pennsylvania had come up with the idea of iron boats and offered it, but he did not take any action to start building an ironclad
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Edwin Stevens and his brother Robert of New York had taken up the idea of an iron boat and had made a contract with the United States of America's government to build an iron boat. The brothers had started to create a naval warship named the Stevens Battery
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During the Crimean Wars the French and the English made the first ironclad warships and fought agaisnt each other.
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The battle between the Monitor and the Merrimack showed the world that wooden ships stood no chance against ironclads.
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Cruisers and Destroyers were inspired by ironclads
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Today there are many naval units inspired by the ironclad like Destroyers, Air-Craft carriers, and Cruisers.