What problems did the secretary describe?

Going to the altar must be investigated is a military book compiled by Wang in Ming Dynasty. Wang (now Huai 'an, Jiangsu) is a master of martial arts and a former general of a title of generals in ancient times. "Going to the altar must be investigated" was written in the twenty-seventh year of Wanli in Ming Dynasty (1599), with 40 volumes and more than 560 pictures, about 1 10,000 words. It is divided into 72 categories, including astronomical geography, military strategy, military training, reward and punishment system, surrounding enemy situation, land and sea border defense, urban attack and defense, and rivers.