Mao opposed all of those initiatives but at first focused his dissatisfaction on other marshals, Liu Bocheng and Luo Ronghuan, whom Mao accused of "dogmatism" (uncritically assimilating methods borrowed from the Soviet Union). In 1958, Mao convinced Peng of the need to maintain a balance between military professionalism and political indoctrination, and Peng co-operated in removing Liu and Luo from high positions. Peng's removal of Liu especially cost Peng the support of many other military leaders, and Mao used Liu's resulting criticism of Peng to criticize Peng before other senior Chinese leaders the next year, when Mao then sought to remove Peng.