Who was the most aggressive and able lieutenant for Sun Yat-sen and the early Republic of China?

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Chiang Kai-Shek was considered the most aggressive and able lieutenant for Sun Yat-sen and the early Republic of China. He played a crucial role in the Northern Expedition, which helped to unify China and establish the Nationalist government led by Chiang. However, his later actions, including the suppression of communists and the authoritarian rule, have been controversial.

Who Was the Most Aggressive and Able Lieutenant for Sun