《明史·列传·卷一百一十》
燕、赵的兵丁的锐气在边防中耗尽了，不招募一万二千多名熟谙战事的吴、越士兵，掺杂在他们中间教练他们，必然难以成事。
燕、赵之士锐气尽于防边，非募吴、越习战卒万二千人杂教之，事必无成。
The troops of Yan and Zhao had exhausted their morale in border defense, and without recruiting 12,000 skilled soldiers from Wu and Yue to join and train them, it would be difficult to achieve anything.
<s>[INST] Explain the meaning of this Classical Chinese passage in English: 燕、赵之士锐气尽于防边，非募吴、越习战卒万二千人杂教之，事必无成。 [/INST] The troops of Yan and Zhao had exhausted their morale in border defense, and without recruiting 12,000 skilled soldiers from Wu and Yue to join and train them, it would be difficult to achieve anything.</s>
Explain the meaning of this Classical Chinese passage in English: 燕、赵之士锐气尽于防边，非募吴、越习战卒万二千人杂教之，事必无成。
user
The troops of Yan and Zhao had exhausted their morale in border defense, and without recruiting 12,000 skilled soldiers from Wu and Yue to join and train them, it would be difficult to achieve anything.
assistant