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General Guan Wen, of the Qing Dynasty, ordered the Green Standard Army, consisting of 500,000 men, to Eastern Henan, to guard the capital at Beijing.
Chen Yucheng suspected a trap. However Chen Decai, Chen Yucheng's uncle, disregarded Chen Yucheng's orders and in November 1861 led the army on an offensive in southern and western Henan. They met with little resistance, but the western Taiping army's front line became over-extended. In the meanwhile Chen Yucheng and the 50,000 Taiping western army soldiers guarding the rear were surrounded by the 150,000 strong Qing army in Hefei.