In 228 BC, Wang Jian, a Qin general defeated Zhao army and occupied its capital, Handan. Jia, a son of Zhao king, escaped to Dai, currently northeast of Yu County and declared himself as the King of Dai. In alliance with Xi, King of Yan, the combined army, commanded by Crown Prince Dan was defeated at Yishui. In 222 BC, Wang Ben, a Qin general defeated Yan state and then, attacked Dai. He captured Jia and ended Dai as a state. Jia feared humiliation and committed suicide.