Every nation has its founding myth, and for modern China it is the Long March. In 1934, the fledgling Communist Party and its 200,000 strong armies were forced out of their bases by Chiang Kaishek and his National troops. Walking more than 10,000 miles over mountains, grassland and swamps, they suffered appalling casualties and ended up in the remote barren North. Just one-fifth survived; and they went on to launch the new China in the heat of revolution. A legend was born. Justified by a remarkable feat, the Long March was also a triumph of propaganda, for Mao and for the revolution. Seventy years later, Sun Shuyun set out to retrace the Marchers' steps. The rugged landscape has changed little. Her greatest difficult was in wrestling with the scenes lodged in her mind since childhood, part of the upbringing of every Chinese.