Unwilling to be a puppet, Cao Mao led his guards against Sima Zhao and was killed.
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Recorded in the 《汉晋春秋》, his cry 司马昭之心,路人所知也 'everyone in the street knows what Sima Zhao is after' gave the saying 司马昭之心,路人皆知, used of an ambition plain to all.