 After hearing of Emperor Wu's death, Northern Zhou had sent Chen Chang back to Chen, but as his path was blocked by Wang's forces, he had to stop at Anlu (安陸, in modern Xiaogan, Hubei).After Wang was defeated, Chen Chang continued his journey, and as he proceeded from Anlu to the Yangtze River, he wrote impolite letters to Emperor Wen, which Emperor Wen took as a demand for the throne.Emperor Wen summoned Hou Andu, suggesting that perhaps he should yield the throne to Chen Chang and accept a princely title.