When your own city is besieged, throwing a wooden sign with inscription into the river and letting the wood go down the river to report to the friendly forces downstream is not a difficult operation to think of.

Especially in a large river like the Jialing River or the Yangtze River, where the flow is stable and the flow speed is turbulent enough, the reliability of this trick is even higher - 1,200 years later, when the Ming Dynasty was founded, Fu Youde and Tang He used this method of communication when they attacked the Ming Xia regime in Shudi, and it was more than a thousand years apart

Chapter 499 of "Brother Zhuge Liang" is difficult to ride a tiger Cao Mengde is hitting in his hand, please wait a moment,

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