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reporter : in days of yore , an english prince , a king in waiting would be charging off to battle on a horse , just before his 21st birthday , prince william is chasing a polo ball , such of what has become of the british monarchy over time .
 attack: battle
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: declare bankruptcy, transfer ownership, marry, die, phone write, arrest jail, convict, sue, transfer money, end organization, start organization, end position, merge organization, start position, transport, charge indict, elect, attack, injure, born, extradite, release parole, sentence, demonstrate, meet, trial hearing, divorce, nominate, fine, appeal, pardon, execute, acquit 
Text: {0} 
Answer:
 attack: battle