【投鞭断流】〖tóu bin duàn liú〗[If the soldiers threw their whips into the river, it would be enough to stem the current -- a big army; an army strong in numbers; throw whips into the stream to stop its flowing]

投戈讲艺众志城，

鞭子集中江里扔。

断港绝潢截水淌，

流扬兵马多强盛。