Smart answer:

Your search for When was art of war written returned the following results:

written during the 6th century BCE by Sun Tzu (孫子)

The Art of War (孫子兵法), written during the 6th century BCE by Sun Tzu (孫子), deals directly with military warfare but contains ideas that are used in the Chinese martial arts.

Source:

written during the 6th century BC by Sunzi

The Art of War is a Chinese military treatise written during the 6th century BC by Sunzi.

Source:

written during the 6th century BC by Sun Tzu

“The Art of War is a Chinese military treatise written during the 6th century BC by Sun Tzu.

Source:

written over 2500 years ago

The art of war was a book written over 2500 years ago.

Source:

a fan of The Art of War—the famous Chinese military treatise written in the 6th century

I’ve been a fan of The Art of War—the famous Chinese military treatise written in the 6th century B.C.—for a long time.

Source:

by a Chinese general called Sun Tzu; which was written during the so called classical Chinese period allegedly around 400 – 320 BC

Nowadays, one of the most ancient (if not the most ancient) treatise about war, is the work “the Art of War” by a Chinese general called Sun Tzu; which was written during the so called classical Chinese period allegedly around 400 – 320 BC.

possibly in the 6th Century BC

The Art of War was written by a Chinese general named Sun Tzu more than 2,500 years ago, possibly in the 6th Century BC.

during the late 6th century BC

Art of War was written during the late 6th century BC, whilst Clausewitz On War was written during the 19th century.

in the 4th or 5th century BCE by Chinese general Sun Tzu (also known as Sunzi or )

The Art of War is the oldest surviving manuscript on military tactics from Ancient China’s hallowed martial tradition, reportedly written in the 4th or 5th century BCE by Chinese general Sun Tzu (also known as Sunzi or “Master Sun”).

during the 6th century B.C.E. by Sun Tzu ( 孫子)

The Art of War ( 孫子兵法), written during the 6th century B.C.E. by Sun Tzu ( 孫子), deals directly with military warfare but contain ideas that are used in the Chinese martial arts.

Source: