The Art of War. by Sun Tzu

Sun Tzu's ancient treatise on the art of war has exerted enormous influence over both Asian and Western soldiers, covering subjects ranging from morale and discipline to the correct use of spies. Despite questions about the historicity of the author, the text has stood the test of time and remains widely read by strategists, politicians, and even business leaders today. Though Dr. Lionel Giles was not the first to translate Sun Tzu into English, he was the first to do so in a systematic and scholarly manner.
His translation was unequaled until the mid-20th century, and remains relevant today due to his copious notes.