Luding Bridge
Fleeing from pursuing Chinese Nationalist forces, the communists found that there were not enough boats to cross the Dadu River (Sichuan province). Thus, they were forced to use Luding Bridge, a Qing dynasty suspension bridge built in 1701. The bridge consisted of thirteen heavy iron chains with a span of some 100 yards. Thick wooden boards lashed over the chains provided the roadway across the bridge.