《明史·列传·卷二百》
不久安国亨杀死安信，安信的兄长安智勾结永宁宣抚奢效忠报仇，彼此相互攻杀。
既而安国亨杀安信，信兄智结永宁宣抚奢效忠报仇，彼此相攻。
Soon An Guoheng killed An Xin. An Xin's brother An Zhi hooked up with Yongning pacification Shexiaoxiaozhong to seek revenge, and they attacked each other.
<s>[INST] Kindly elucidate the central themes in this passage in English: 既而安国亨杀安信，信兄智结永宁宣抚奢效忠报仇，彼此相攻。 [/INST] Soon An Guoheng killed An Xin. An Xin's brother An Zhi hooked up with Yongning pacification Shexiaoxiaozhong to seek revenge, and they attacked each other.</s>
Kindly elucidate the central themes in this passage in English: 既而安国亨杀安信，信兄智结永宁宣抚奢效忠报仇，彼此相攻。
user
Soon An Guoheng killed An Xin. An Xin's brother An Zhi hooked up with Yongning pacification Shexiaoxiaozhong to seek revenge, and they attacked each other.
assistant