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Engagement The stage for the battle was set when , in October , the Earl of Northumberland led a troop of 6,000 men into Scotland , where they made camp near the Lochmaben Stone .
 Earl, Northumberland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Earl, Northumberland