24881
With the help of a several battalions of Armenians recruited from the Russian Empire , the Russian army had made progress on the Caucasus Front , advancing as far as the city of Erzerum in 1916 .
 Empire, Erzerum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Empire, Erzerum