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This book is divided into two parts: the first part is about Lishui Tongji Weir, mainly based on the text of the Tongji Weir protection plan, including an overview of Tongji Weir, special assessments, protection planning and measures, and historical inscriptions; the second part is about the research on ancient water conservancy in Zhejiang, including water conservancy construction in the past dynasties, water conservancy management and concepts, water conservancy technology and development, water conservancy inscriptions, etc.

By carefully reading historical documents and collating relevant records, the author has developed many independent and novel analyzes and insights. As for the history of coastal defense in the Ming Dynasty, due to the large number of relevant records, the general framework is relatively clear, but when it comes to specific parts, few people have done in-depth research. The manuscript contains analysis and judgments worthy of attention in aspects such as coastal defense warships, Japanese preparedness organizations, war results against Japanese pirates, Japanese pirate issues, and Jiao Hong's evaluation. For example, the coastal defense warships made an in-depth analysis of the types of early and late warships, and based on the "History of the Ming Dynasty" data, it was concluded that the early "sea ships" were mostly modified flat-bottomed river boats. The later fuchuan eventually replaced the early official ships because they were more suitable for sea operations. Regarding the issue of the establishment of Haido's Deputy Envoy and Pre-Wado Division, this book is based on the records of "Wuzong Shilu" and other records and the establishment of the patrol censor and Haido's political participation in the Zhengtong years. It overturns the "Sejong Shilu" and "Zhaohaitubian" records that it was established in the early years of Hongwu. The analysis of the Japanese war record, based on the phenomenon of repeated victories in naval battles and repeated defeats in land battles, as well as the early successes of Tang Kekuan and Liu Xian with "Xu Pi soldiers" and "Two Thousand Sichuan soldiers", and the late Tan Lun and Qi Jiguang who were undefeated with local soldiers, pointed out that it was not the Japanese pirates who had strong combat effectiveness, but the main reason was that the combat effectiveness of the guards' officers and soldiers at that time was too fragile. In addition, the book has in-depth research and analysis on many aspects such as military ship patrols, Zhejiang coastal guard establishment, maritime ban issues, etc., And there are many innovations in it.

In a sudden disaster, Shen Xiyue accidentally passed through the body of his female partner with the same name and surname!