《资治通鉴·唐纪·唐纪七十八》
别将白奉国会同成德军队自井陉攻入，已未攻克承天军，与氏叔琮的军队烽火相呼应。
别将白奉国会成德兵自井陉入，己未，拔承天军，与叔琮烽火相应。
White Fengui, a visiting general, joined forces with the Chengde army to attack from Jingxing, and on Wei day, Chengtian Military Prefecture was captured, with beacon fires responding to Shi Shucong's army.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 别将白奉国会成德兵自井陉入，己未，拔承天军，与叔琮烽火相应。 [/INST] White Fengui, a visiting general, joined forces with the Chengde army to attack from Jingxing, and on Wei day, Chengtian Military Prefecture was captured, with beacon fires responding to Shi Shucong's army.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 别将白奉国会成德兵自井陉入，己未，拔承天军，与叔琮烽火相应。
user
White Fengui, a visiting general, joined forces with the Chengde army to attack from Jingxing, and on Wei day, Chengtian Military Prefecture was captured, with beacon fires responding to Shi Shucong's army.
assistant