《资治通鉴·唐纪·唐纪七十七》
丁未，李思安派遣手下将领袁象先在清河水的右侧埋伏下军队，李思安在繁阳迎战刘守文，假装不能取胜而后退；刘守文追击李思安，到内黄县的北部，李思安率领军队回头攻打，埋伏下的军队也发起进攻，两面夹击。
丁未，思安使其将袁象先伏兵于清水之右，思安逆战于繁阳，阳不胜而却，守文逐之。及内黄之北，思安勒兵还战，伏兵发，夹击之。
On Dingwei, Li Sian sent his subordinate general Yuan Xiangxian to ambush the army on the right side of the Qinghe River. Li Sian fought against Liu Shouwen in Fanyang and pretended to be defeated and retreated; Liu Shouwen pursued Li Sian to the north of Neihuang County. Li Sian led the army to turn around and attack, and the ambushing army also attacked, sandwiching them.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 丁未，思安使其将袁象先伏兵于清水之右，思安逆战于繁阳，阳不胜而却，守文逐之。及内黄之北，思安勒兵还战，伏兵发，夹击之。 [/INST] On Dingwei, Li Sian sent his subordinate general Yuan Xiangxian to ambush the army on the right side of the Qinghe River. Li Sian fought against Liu Shouwen in Fanyang and pretended to be defeated and retreated; Liu Shouwen pursued Li Sian to the north of Neihuang County. Li Sian led the army to turn around and attack, and the ambushing army also attacked, sandwiching them.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 丁未，思安使其将袁象先伏兵于清水之右，思安逆战于繁阳，阳不胜而却，守文逐之。及内黄之北，思安勒兵还战，伏兵发，夹击之。
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On Dingwei, Li Sian sent his subordinate general Yuan Xiangxian to ambush the army on the right side of the Qinghe River. Li Sian fought against Liu Shouwen in Fanyang and pretended to be defeated and retreated; Liu Shouwen pursued Li Sian to the north of Neihuang County. Li Sian led the army to turn around and attack, and the ambushing army also attacked, sandwiching them.
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