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During the early Eastern Jin Dynasty, the Former Qin state grew increasingly powerful. After ascending the throne, Fu Jian was determined to unify the country by conquering Eastern Jin.
In a court assembly, he sought opinions on personally leading a campaign. Zhu Tong, the Secretary Overseer, strongly supported the idea, while Zuo Puye (Left Prime Minister) Quan Yi argued against it, citing the Yangtze River as a natural barrier for Jin.
Fu Jian, however, boasted, "Our million-strong army is so vast that if each soldier were to throw their whip into the Yangtze River, it would be enough to block its flow." This idiom later came to symbolize a huge and powerful army.

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Open the tool →投鞭断流 (tóu biān duàn liú) is a Chinese idiom (chengyu) meaning “to describe a huge and powerful army, so numerous and mighty that if its soldiers were to throw their whips into a river, it would be enough to block the flow and stem the current; signifying an overwhelming force”.
投鞭断流 is pronounced tóu biān duàn liú in Mandarin Chinese.
Literally, 投鞭断流 means “throw whips to stem the current”. It is used to mean “to describe a huge and powerful army, so numerous and mighty that if its soldiers were to throw their whips into a river, it would be enough to block the flow and stem the current; signifying an overwhelming force”.
投鞭断流 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
把所有的马鞭投到江里,就能截断水流。比喻人马众多,兵力强大。