On this Day in Chinese History; 30 July

This day, 31 July, 1989, the iron oxen of the Tang Dynasty were unearthed in Yongji County of Shanxi Province. Cast in 725 BCE to stabilise the Pujin floating bridge and connect Sha’anxi with Shanxi, at the end of the Yuan Dynasty the bridge was destroyed, the Yellow River changed its channel and the iron oxen were gradually buried by the sands of the River.