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First Bishops ' War ( 1639 ) Despite problems in raising funds , Charles gathered a poorly trained English force of around 20,000 men in the early summer of 1639 and marched to the vicinity of Berwick-upon-Tweed on the English side of the border .
 Berwick-upon-Tweed
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berwick-upon-Tweed