"His Majesty is far away in Chang'an City. It would take a long time to go there and back to ask for instructions and the black horse carriage is already at our gates." These words from General Han Qing seemed incredibly irresponsible, however, the people in the room didn't show such an expression but only shock.
The Tang Empire's army had three Fu character transmission arrays along the border that could transmit extremely short fragments of information. One of them was in Helan City and could reach the palace of Chang'an City directly.
The information that could be passed by a transmission array was incredibly little. Activating it once would use up an unimaginable amount of energy. Especially the one in Helan City, as the transmitting distance was too far, the price to pay was much higher. According to the calculations of the designer, using it once would cost as much as 10 years of Helan City's supplies.
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