《明史·列传·卷九十二》
于是操练队伍士兵，修缮营垒，经常如临大敌。
乃练卒伍，缮营垒，常若临大敌。
Thus, he drilled army soldiers and repaired barracks, often acting as if facing a formidable enemy.
<s>[INST] Kindly elucidate the central themes in this passage in English: 乃练卒伍，缮营垒，常若临大敌。 [/INST] Thus, he drilled army soldiers and repaired barracks, often acting as if facing a formidable enemy.</s>
Kindly elucidate the central themes in this passage in English: 乃练卒伍，缮营垒，常若临大敌。
user
Thus, he drilled army soldiers and repaired barracks, often acting as if facing a formidable enemy.
assistant