Under what circumstances was the military book Military Tactics discovered?

In the early 1960s, when Mr. Wang Zhongmin was editing the Collected Works of Xu Guangqi, he only listed what he needed to consult because he could not find the above documents. 1982, General Mo Wenhua, former political commissar of the Armored Forces of the People's Liberation Army, sent a batch of important ancient military books collected for many years to the Academy of Military Sciences for reference. Among them, the long-lost important military work Tactics of Military Strategists was copied by A&B (1804) in the ninth year of Jiaqing. The military volume newsletter sent a special message. Experts and scholars from Shanghai rushed to Beijing when they heard the news. With the enthusiastic support of General Mo, they quickly sorted out and photocopied the book and published it in Xu Guangqi, Shanghai Ancient Books Publishing House.