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The City Class gunboats were the United States ' first ironclad warship s. The gunboats produced by Eads formed the core of the US Army 's Western Gunboat Flotilla , which later was transferred to the US Navy and became the Mississippi River Squadron .
 Eads, Western Gunboat Flotilla, Mississippi River Squadron
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Eads, Western Gunboat Flotilla, Mississippi River Squadron