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On 4 August 1914 , just prior to the outbreak of war , he was assigned by Sir Berkeley Milne to shadow the German squadron under Rear-Admiral Wilhelm Souchon , consisting of the cruiser and the battlecruiser .
 Sir Berkeley Milne, Wilhelm Souchon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sir Berkeley Milne, Wilhelm Souchon