As ties with Washington sour, China is reviving a cold war strategy to defend against a US attack As ties with Washington sour, China is reviving a cold war strategy to defend against a US attack Millions of workers were deployed to these remote mountain locations as part of a huge defence program that stayed secret for over a decade. Fearing a war with either the Soviet Union or the US, Mao’s program mobilised 15 million people to fortify China’s defences. In Sichuan, many of the factories are