Báidēng

Baideng is remembered for a confrontation between the early Han and the Xiongnu near the ancient city of Pingcheng. In 200 BCE, the Xiongnu ruler Modu surrounded Emperor Gaozu for seven days before the Han army escaped. The defeat helped bring about a policy of marriage alliances and gifts between the two powers. Later writers continued to identify hills near Datong with the famous battlefield.