Long March
The Long March is the  retreat of Mao Zedong and the Communists in 1934-35. The communists went to their stronghold away from Chiang Kai-shek and the Nationalists. Here they were able to join together and start fighting again to beat the Nationalists. They trekked 6,000 miles over 370 days, and only 8,000 survived out of 100,000 people. However, because they had survived such a difficult trial together the survivors were very dedicated and created a more cohesive group. Mao Zedong rose up as a leader during this time.