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On that day , he was among a group of sailors who went ashore with a howitzer to help repulse a Confederate attack on Yazoo City , Mississippi .
 Confederate, Yazoo City , Mississippi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Confederate, Yazoo City , Mississippi