 Retrieved on 2008-08-20.Other early finds of crossbows were discovered in Tomb 138 at Saobatang, Hunan dated to the mid 4th century BC.Repeating crossbows, first mentioned in the "Records of the Three Kingdoms", were discovered in 1986 in Tomb 47 at Qinjiazui, Hubei dated to around the 4th century BC.