During the Three Kingdoms period, General Lu Su of Eastern Wu was ordered to garrison at Baqiu and train the navy. He constructed the ancient Baqiu city in a strategic section where Dongting Lake meets the Yangtze River. In the 20th year of Jian'an during the Eastern Han Dynasty (AD 215), Lu Su built a tower as part of the city fortifications, which was used for training and reviewing the naval forces...