carry out a campaign without any justifiable reason; despatch troops (/send army out) without a righteous cause
❍ 国王～，不久就被打败。The king sent out an army without a righteous cause,and it was routed very soon.
师出无名
dispatch troops without a just cause;do sth without a proper reason
师出无名shī chū wú mínɡ
指出动军队没有正当的理由。dispatch troops without just cause, act without any justifiable reason