Chang Geng answered, "If the information in the battle report is correct, the Westerners can't carry too many supplies with them — they can't afford to fight either. If they want to deliver a fatal strike, coming from Jiangnan, they must divide their forces into two ways. They will press on to the capital from the sea route, cut off the passageway from the capital to the four sides and besiege us... I'm afraid the summoning order will not be able to pass to the outside anymore.”

Master Feng Han almost fainted on the spot, he fell down on the chair, breathing heavily.

Chang Geng did not expect such a strong reaction from him. He immediately poured a cup of water and brought it in front of Master Feng Han. He skillfully patted several acupoints at his back and said, "Please stay calm. Older people should try not to be overly joyful or overly sorrowful, otherwise it will easily lead to a stroke..."

Zhang Feng Han grabbed his hand and almost burst into tears: "My Royal Highness, do you not know what anxiousness is?"

"Master Feng Han rest assured, I haven't finished yet," Chang Geng hurriedly said: "When yifu was imprisoned, fearing that there might be changes at the border, I already contacted some friends."

As he said this, he took a wooden bird out of his sleeve.

"This kind of wooden bird needs a special kind of magnet to lead the way, which can be used to communicate with other people who also hold these magnets. They received my letters and should have already departed for the major garrisons separately; I hope they will arrive in time.”

“If the capital city truly falls under siege, I can use wooden birds to communicate this information to them and let them spread the news on our behalf. With the Black Tiger Emblem and my yifu’s private seal, it should be enough to gain trust."

When Chang Geng realized that the long communication between different places would delay the war news, he had begun to make use of Lin Yuan Pavilion to set up a massive communication network ready for the near future.

Tan Hong Fei and Zhang Feng Han stared at Chang Geng with their mouths agape.

"It's only a small trick. Under such urgency, I can't think of any other way," Chang Geng said, "It can be used for emergencies at the present while it is still unknown to the enemy, but it cannot continue on in the long run. Once the enemy is aware of it, it will no longer be safe. Any small stone can easily shoot it down."