166538
The prewar chain of command was : military district , Corps ( or Army Corps ) , then to Division , Brigade , Regiment , and then the regiment 's battalions .
 Corps, Corps, Division, Brigade
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Corps, Corps, Division, Brigade