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Members of the U . S . Army ' s V Corps opened up a new front by entering Baghdad from the north .
 Members: attacker; Baghdad: place
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 Members: attacker; Baghdad: place