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They were immediately attached to the Army of the Frontier , and dispatched to Arkansas under the command of Lieutenant Colonel Elias Briggs Baldwin , where they took part in the Battle of Prairie Grove .
 Army of the Frontier, Arkansas, Elias Briggs Baldwin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Army of the Frontier, Arkansas, Elias Briggs Baldwin