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The Northern States were building the Great Wall to keep out the Barbarians and protect their land.
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Yang Hu was the military general from the state of Lu. He was rumored to be as intelligent as Confucius and a great military strategist.
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The peace between the major states was broken by King Wu, who did not sign the pact of Shangch'iu, which was a pact that was supposed to stop the Chinese states from fighting one another.
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The Art of War is what Sun Tzu is most known for. It is a book on military strategy that changed the way war was fought forever. This was also the year that Wu employed Sun Tzu.
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King Helü of Wu was the king of the state of Wu from 514 BC to 496 BC. He is also the person who employed Sun Tzu as a military strategist.
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Sun Tzu was born in 544 BC in the Spring and Autumn period, which started in 722 BC and ended in 256 BC.
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Sun Tzu died when he was around 48 years old. His book, the Art of War, was not very popular yet, but was still used by some Chinese generals.