In 1974, near Xian, the ancient capital of China, a group of peasants digging a well came upon an entire army of 6,000 soldiers, officers, men, horses and chariots - all sculpted in terracotta. This extraordinary find proved to be the battle array of the first Emperor of China, the man who built the Great Wall and died in 210 BC. Colin Renfrew traces the reasons for this amazing burial and, with exclusive film acquired from China, Chronicle looks in detail at the Emperor's army, now being excavated and displayed 22 centuries later to an astonished world.