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Chapter 221: Invincible
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... flying and the magic of the telescope, Grand Marshal Xu immediately gathered his generals and worked with Li Yao to figure out a long distance communication method.
He picked some clever and agile soldiers from the army, taught them to use flags to convey different signals, and Li Yao gave them a name called signalmen.
The signalmen would be arranged on hot air balloons, while more would follow the cavalry going into battle.
The signalmen on the hot air balloons would use ...
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