 In terms of archaeological evidence, crossbow locks made of cast bronze have been found in China dating to around 650 BC.They have also been found in Tombs 3 and 12 at Qufu, Shandong, previously the capital of Lu, and date to 6th century BC.Bronze crossbow bolts dating from the mid-5th century BC have been found at a Chu burial site in Yutaishan, Jiangling County, Hubei Province.