7856
However , after an unsuccessful advance against the Red Army along the Northern Dvina in the summer of 1919 , British forces withdrew from the region and Miller 's men faced the enemy alone .
 organization: Red Army; person: Miller
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Red Army; person: Miller