《魏书·列传·卷六十三》
当时高平大旱，尔朱天光因马缺少草料，便退到离城东五十里的地方，息兵牧马。
时高平大旱，天光以马乏草，乃退于城东五十许里，息众牧马。
At that time, there was a severe drought in Gaoping. Er Zhu Tianguang retreated to a place 50 miles east of the city because there was not enough fodder for the horses, and he rested his troops and grazed the horses.
<s>[INST] Kindly elucidate the central themes in this passage in English: 时高平大旱，天光以马乏草，乃退于城东五十许里，息众牧马。 [/INST] At that time, there was a severe drought in Gaoping. Er Zhu Tianguang retreated to a place 50 miles east of the city because there was not enough fodder for the horses, and he rested his troops and grazed the horses.</s>
Kindly elucidate the central themes in this passage in English: 时高平大旱，天光以马乏草，乃退于城东五十许里，息众牧马。
user
At that time, there was a severe drought in Gaoping. Er Zhu Tianguang retreated to a place 50 miles east of the city because there was not enough fodder for the horses, and he rested his troops and grazed the horses.
assistant