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there were small pockets of resistance in the area , two , three man groups who had ak - 47s and possible rpgs and what not and our job was to just observe forward and make sure no one was waiting to ambush the avs or the tanks and i was on a metal roof and i stepped
 ( attack: ambush,  groups: attacker, area: place, avs: target, tanks: target, ak - 47s: instrument, rpgs: instrument, what not: instrument) 
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:
 ( attack: ambush,  groups: attacker, area: place, avs: target, tanks: target, ak - 47s: instrument, rpgs: instrument, what not: instrument) 