It was a book that was written by Sun Tzu on the art of war.
The Art of War (Chinese: 孫子兵法; pinyin: Sūn Zǐ Bīng Fǎ) is a Chinese military treatise that was written by Sun Tzu in the 6th century BC, during the Spring and Autumn period. Written more...
The Spartans did triumph over Athens in the Peloponnesian War from 431 to 404 BC .
Technically it is by Sun-Tzu from like 300 B.C. but people have translated the book.
Train few Archers to beat the swordwraths in the game Stick War