The terracotta soldiers were thousands of terracotta statues of soldiers found in the tomb of the first Emperor of China Qin Shi Huang.
The Fifth Doctor told Erimem that he delivered the Terracotta Army to the Emperor during his third incarnation. (AUDIO: No Place Like Home)
In 210 BC, the Second Doctor's companions Jamie McCrimmon and Victoria Waterfield discovered the Terracotta Army. (AUDIO: The Emperor of Eternity)
On 27 July 1928, Edward Grainger, Carter, Ambrose and Bryce Convey tried to steal the Terracotta soldiers. While Carter and Grainger tried to take the statues by plane to Calcutta, Convey and Ambrose took the long way, getting out of China on foot. (PROSE: Falling from Xi'an)