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French naval forces had been blockade d in their harbours during the conflict , and often the only method of attacking them was through fireship s or " cutting-out " expeditions , in which boats would carry boarding parties into the harbour at night , seize ships at anchor and bring them out .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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