13182
During the Civil War served in the Union Army as a volunteer aide-de-camp to General George B. McClellan .
 Civil War, Union Army, George B. McClellan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Civil War, Union Army, George B. McClellan