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The Iraqi unit in possession of those guns fired mortars in the direction of the 7th Cavalry .
 unit: attacker; 7th Cavalry: target; mortars: instrument
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:
 unit: attacker; 7th Cavalry: target; mortars: instrument