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D is the correct answer

Explanation:That new regular army developed the techniques of battle and siege that were used to achieve most of the 14th-century Ottoman conquests, but, because it was commanded by members of the Turkish notable class, it became the major vehicle for their rise to predominance over the sultans, whose direct military supporters ...:0

it was important in history as the site of the ancient city of yin

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c. troops marched forward in close formation against newer, more accurate weapons