Toubi futan 投筆膚談 "Superficial talks of throwing away the brush" is a military treatise written during the late Ming period 明 (1368-1644) by a scholar called "Retired scholar from the West Lake", Xihu Yishi 西湖逸士. A commentary on the book written by He Shoufa 何守法 (fl. 1604). The book comprises 2 juan with 13 chapters and was written as an imitation of the old military classic Sunzi bingfa 孫子兵法. Therefore, the titles of the chapters are partially identical those of the Sunzi. The words "throwing the away the brush" in the book's title mean "to give up civilian life and become a soldier".
In the first part, the author explains that war was a means to abolish rebellions and punish bandit groups. The art of war made it necessary that thorough planning was carried out before going into battle. The right encampment was equally important to the battlefield, and defence was considered just as important as attack. The control of the own troops was necessary before challenging that of the enemy, and the better one knew the enemy through espionage, the easier the game would be. All chances for victory had to be used, and the troops had to engage their own heart, save their spirits, and concentrate their minds on the concrete situations in the battle to be ready for the correct adaption to circumstances. The second part explains the selection of qualified generals and the arrangement of military units. During battle, the formations and the type of troops employed had to be adapted to the particular requirements. Weather and topography, as well as astrology, played essential parts in planning warfare.
There is a print from the Hongxi Studio 弘錫堂 from 1604.