Under which Chinese dynasty below did the crossbow and iron weapons begin to flourish in warfare?

Zhou Dynasty

Iron and steel smelting

It has been confirmed by archaeological evidence that iron, made from melting pig-iron, was developed in ancient China in the early 5th century BC during the Zhou Dynasty (1050 BC－256 BC).

The Shang Dynasty marked the middle of China's Bronze Age and was a dynasty that made great contributions to Chinese civilization.

Explanation:

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a, both were musicians during the jazz age