《明史·志·卷五》
十五年二月，绥靖边城各堡，脊兽、旗杆都发出火光。
十五年二月，绥靖边城各堡，脊兽旗杆俱出火。
In February of the fifteenth year, firelights appeared from the hip tiles and flagpoles of the forts at Suijingbian City. 
<s>[INST] Kindly elucidate the central themes in this passage in English: 十五年二月，绥靖边城各堡，脊兽旗杆俱出火。 [/INST] In February of the fifteenth year, firelights appeared from the hip tiles and flagpoles of the forts at Suijingbian City. </s>
Kindly elucidate the central themes in this passage in English: 十五年二月，绥靖边城各堡，脊兽旗杆俱出火。
user
In February of the fifteenth year, firelights appeared from the hip tiles and flagpoles of the forts at Suijingbian City.
assistant