1678
After the first battle between two ironclads took place in 1862 during the American Civil War , it became clear that the ironclad had replaced the unarmoured line-of-battle ship as the most powerful warship afloat .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None