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Whilst serving in the Union Army during the Civil War , Gilmore wrote the lyrics to the song " When Johnny Comes Marching Home " , the tune he took from an old Irish antiwar folk song , " Johnny I Hardly Knew Ye " .
 Union Army, Gilmore
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Union Army, Gilmore