《汉书·传·王莽传下》
等到后来汉军刘伯升起事，都自称将军，攻打城市，占领地盘，杀死甄阜之后，发布文告，宣传自己的主张，声讨王莽的罪恶。
及后汉兵刘伯升起，皆称将军，攻城略地，既杀甄阜，移书称说。
When Liu Bo ascended in the Later Han Dynasty, he called himself a general and attacked cities, occupied territories, and killed Zhen Fu. After that, he issued a document to promote his principles and denounce Wang Mang’s crimes.
<s>[INST] Kindly elucidate the central themes in this passage in English: 及后汉兵刘伯升起，皆称将军，攻城略地，既杀甄阜，移书称说。 [/INST] When Liu Bo ascended in the Later Han Dynasty, he called himself a general and attacked cities, occupied territories, and killed Zhen Fu. After that, he issued a document to promote his principles and denounce Wang Mang’s crimes.</s>
Kindly elucidate the central themes in this passage in English: 及后汉兵刘伯升起，皆称将军，攻城略地，既杀甄阜，移书称说。
user
When Liu Bo ascended in the Later Han Dynasty, he called himself a general and attacked cities, occupied territories, and killed Zhen Fu. After that, he issued a document to promote his principles and denounce Wang Mang’s crimes.
assistant