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The Warring States Period of China

The Warring States Period also known as the Era of Warring States, covers the period from some time in the 5th century BCE to the unification of China by the Qin Dynasty in 221 BCE. It is nominally considered to be the second part of the Eastern Zhou Dynasty, following the Spring and Autumn Period, although the Zhou dynasty itself ended in 256 BCE, 35 years earlier than the end of the Warring States period. As with the Spring and Autumn Period, the king of Zhou acted merely as a figurehead. The name Warring States Period was derived from the Record of the Warring States, a work historically compiled early in the Han Dynasty. The date for the beginning of the Warring States Period is somewhat in dispute. While it is frequently cited as 475 BCE (following the Spring and Autumn Period), 403 BCE — the date of the tripartition of the Jin — is also sometimes considered as the beginning of the period.

The Warring States Period, in contrast to the Spring and Autumn Period, was a period when regional warlords annexed smaller states around them and consolidated their rule. The process began in the Spring and Autumn Period, and by the 3rd century BC, seven major states had risen to prominence. These Seven Warring States, were the Qi , the Chu , the Yan , the Han , the Zhao , the Wei and the Qin . Another sign of this shift in power was a change in title: warlords once considered themselves dukes of the Zhou dynasty king; but now the warlords began to call themselves kings , meaning they were equal to the Zhou king.

The Warring States Period saw the proliferation of iron working in China, replacing bronze as the dominant metal used in warfare. Areas such as Shu (modern Sichuan) and Yue (modern Zhejiang) were also brought into the Chinese cultural sphere during this time. Different philosophies developed into the Hundred Schools of Thought, including Confucianism (elaborated by Mencius), Taoism (elaborated by Lao Zi and to a lesser extent Zhuang Zi, in that it is possible to see the philosophy espoused in the text of the Zhuang Zi as separate from what could be considered "classical Daoism"), Legalism (formulated by Han Feizi) and Mohism (formulated by Mozi). Trade also became important, and some merchants had considerable power in politics. Military tactics also changed. Unlike the Spring and Autumn Period, most armies in the Warring States Period made combined use of infantry and cavalry, and the use of chariots gradually fell into disfavor. Thus from this period on, the nobles in China remained a literate rather than warrior class, as the kingdoms competed by throwing masses of soldiers against each other. Arms of soldiers gradually changed from bronze to unified iron arms. Dagger-axes were an extremely popular weapon in various kingdoms, especially for the Qin who produced eighteen-foot long pikes.

This was also around the time the legendary military strategist Sun Tzu (Sun Zi) wrote The Art of War which is recognized today as the most influential, and oldest known military strategy guide. Along with this are other military writings that make up the Seven Military Classics of ancient China: T'ai Kung's Six Secret Teachings, The Methods of the Sima, Sun Bin's Art of War, Wu Qi, Wei Liaozi, Three strategies of Huang Shigong, and The Questions and Replies of Tang Taizong and Li Weigong (the last being made ±800 years after this era ended). Once China was unified, these seven military classics were locked away and access was restricted due to their tendency to promote revolution.