《汉书·传·匈奴传下》
乌桓被打散，有人跑上了山，有人到束边去凭堡垒自保。
乌桓分散，或走上山，或东保塞。
The Wuhans were scattered, some ran up the mountain, and some went to the border to protect themselves with fortresses.
<s>[INST] Kindly elucidate the central themes in this passage in English: 乌桓分散，或走上山，或东保塞。 [/INST] The Wuhans were scattered, some ran up the mountain, and some went to the border to protect themselves with fortresses.</s>
Kindly elucidate the central themes in this passage in English: 乌桓分散，或走上山，或东保塞。
user
The Wuhans were scattered, some ran up the mountain, and some went to the border to protect themselves with fortresses.
assistant