《资治通鉴·晋纪·晋纪三十四》
北魏博士李先说： 兵法云：驻军在高的地方，就要被敌人围困；驻军在地势低洼的地方，就要被敌人囚禁。
魏博士李先曰： 兵法：高者为敌所栖，深者为敌所囚。
Physician Li Xian of the Northern Wei state said: The art of war says: If you garrison on a high place, you will be besieged by the enemy; if you garrison on a low place, you will be captured by the enemy.
<s>[INST] Kindly elucidate the central themes in this passage in English: 魏博士李先曰： 兵法：高者为敌所栖，深者为敌所囚。 [/INST] Physician Li Xian of the Northern Wei state said: The art of war says: If you garrison on a high place, you will be besieged by the enemy; if you garrison on a low place, you will be captured by the enemy.</s>
Kindly elucidate the central themes in this passage in English: 魏博士李先曰： 兵法：高者为敌所栖，深者为敌所囚。
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Physician Li Xian of the Northern Wei state said: The art of war says: If you garrison on a high place, you will be besieged by the enemy; if you garrison on a low place, you will be captured by the enemy.
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