《明史·列传·卷七十一》
敌人侵犯边塞，乔新同参将支玉在灰沟营设埋伏，击斩大量敌人，升左副都御史。
敌犯塞，偕参将支玉伏兵灰沟营，击斩甚众，进左副都御史。
When the enemy invaded the border, Qiao Xin and Deputy General Zhi Yu set up an ambush in Huigou Camp and killed a large number of enemy forces, and thus Qiao Xin was promoted to Acting Vice Secretary of the Bureau of Metropolitan.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 敌犯塞，偕参将支玉伏兵灰沟营，击斩甚众，进左副都御史。 [/INST] When the enemy invaded the border, Qiao Xin and Deputy General Zhi Yu set up an ambush in Huigou Camp and killed a large number of enemy forces, and thus Qiao Xin was promoted to Acting Vice Secretary of the Bureau of Metropolitan.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 敌犯塞，偕参将支玉伏兵灰沟营，击斩甚众，进左副都御史。
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When the enemy invaded the border, Qiao Xin and Deputy General Zhi Yu set up an ambush in Huigou Camp and killed a large number of enemy forces, and thus Qiao Xin was promoted to Acting Vice Secretary of the Bureau of Metropolitan.
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