In December, Defence Minister and Mao loyalist Lin Biao accused General Luo Ruiqing, the chief of staff of the PLA, of being anti-Mao, alleging that Luo put too much emphasis on military training rather than Maoist "political discussion." Despite initial skepticism in the Politburo of Luo's guilt, Mao pushed for an 'investigation', after which Luo was denounced, dismissed, and forced to deliver a self-criticism. Stress from the events led Luo to attempt suicide. Luo's removal secured the military command's loyalty to Mao.