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The first sizable relief convoy arrived in Iraq during a sandstorm Wednesday as allied forces struggled to clear the way for more aid shipments , using dolphins to remove mines from waterways and hunting Iraqi fighters around the port of Umm Qasr .
 ( transport: arrived,  convoy: vehicle, Iraq: destination, port: destination, forces: agent) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: declare bankruptcy, transfer ownership, transfer money, marry, transport, die, phone write, arrest jail, convict, sentence, sue, end organization, start organization, end position, start position, meet, elect, attack, injure, born, fine, release parole, charge indict, extradite, trial hearing, demonstrate, divorce, nominate, appeal, pardon, execute, acquit, merge organization, Arguments type: beneficiary, prosecutor, plaintiff, seller, victim, buyer, agent, destination, artifact, organization, recipient, person, place, origin, target, giver, adjudicator, attacker, vehicle, defendant, entity, instrument. 
Text: {0} 
Answer:
 ( transport: arrived,  convoy: vehicle, Iraq: destination, port: destination, forces: agent) 