In summer 1973, the Khmer Rouge launched its first major assault on Phnom Penh, but was forced back amid heavy losses. Later that year, it began bombarding the city with artillery. In the autumn, Pol Pot traveled to a base at Chrok Sdêch on the eastern foothills of the Cardamom Mountains. By winter, he was back at the Chinit Riber base where he conferred with Sary and Chea. He concluded that the Khmer Rouge should start talking openly about its commitment to making Cambodia a socialist society and launch a secret campaign to oppose Sihanouk's influence. In September 1974, a Central Committee meeting was held at Meakk in Prek Kok commune. There the Khmer Rouge agreed that it would expel the populations of Cambodia's cities to rural villages. They thought this was necessary to dismantle capitalism which they associated with the urban culture.