Mainland's 'most severe setback'
May 16, 1966 The Communist Party issues the May 16 notice announcing the start of the Great Proletarian Cultural Revolution
May 25 A big-character poster is put up at Peking University denouncing school leaders; sparks soon spread to other universities and secondary schools, with Red Guards spurning classes to join the revolution and vowing to 'die fighting to protect Chairman Mao'
August 1 Mao Zedong supports the Red Guards in a speech to the 11th plenum of the eighth Communist Party Congress
August 5 Mao writes a big-character poster headlined 'Bombard the Headquarters' - a clear attack on state president Liu Shaoqi
August 8 The party plenum ends with a 16-point document on the revolution setting down so-called guidelines.
August-November Mao receives an estimated 11 million Red Guards from across the country on eight occasions in Tiananmen Square