The Art of War : The Classic Military Book (Annotated)

The Art of War is an ancient Chinese military treatise attributed to Sun Tzu, a high-ranking military general, strategist and tactician. The text is composed of 13 chapters, each of which is devoted to one aspect of warfare. It is commonly known to be the definitive work on military strategy and tactics of its time. It has been the most famous and influential of China's Seven Military Classics, and "for the last two thousand years it remained the most important military treatise in Asia, where even the common people knew it by name."[1] It has had an influence on Eastern and Western military thinking, business tactics, legal strategy and beyond.
Sun Tzu considered war as a necessary evil that must be avoided whenever possible. The war should be fought swiftly to avoid economic losses: "No long war ever profited any country: 100 victories in 100 battles is simply ridiculous. Anyone who excels in defeating his enemies triumphs before his enemy's threats become real".

Sun Tzu emphasized the importance of positioning in military strategy. The decision to position an army must be based on both objective conditions in the physical environment and the subjective beliefs of other, competitive factors in that environment. He thought that strategy was not planning in the sense of working through an established list, but rather that it requires quick and appropriate responses to changing conditions. Planning works in a controlled environment; but in a changing environment, competing plans collide, creating unexpected situations.