1, beacon tower
Beacon tower is also called beacon tower, commonly known as beacon tower, smoke pier and trestle. The high platform used to light fireworks and deliver important news in ancient times is an important military defense facility in ancient times, which was built to prevent the enemy from invading. In case of enemy situation, give cigarettes during the day, light them at night, and receive messages from the platform. It is the oldest but effective way to transmit information.
2, wolf smoke
As early as the Song Dynasty, in order to resist foreign invasion, Dasong put wolf dung and firewood on every wind and fire in Qin Changcheng. Once an intruder is found, it will ignite wolf dung and firewood and send out a signal fireworks. This is the original intention of Wolf Smoke. In fact, after the wolf dung is ignited, it is not like a raging fire, but a white light smoke. The use of wolf dung is meaningful because the army can cope with and defend itself.
3. Post office
Postal transmission developed from early acousto-optic communication and express mail. China's postal service has a long history. Communication with objects appeared in primitive society, and slave society developed into early acousto-optic communication and postal transmission. In the feudal society, China's postal service had been at the forefront of the world.
4. Hongyan
According to Records of the Historian, during the reign of Emperor Wu of the Han Dynasty, Su Wu, the envoy, was detained by Xiongnu and held in the bitter and cold land of Beihai for many years. Later, the Han Dynasty sent messengers to ask Xiongnu Hongyan to release Su Wu, but Xiongnu Khan lied that Su Wu was dead.
At this time, someone secretly told the truth of the matter to the Han ambassador, and gave him advice to tell the Huns that Emperor Xian of Han had shot down a wild goose in Shanglinyuan, and Su Wu's silk book was tied to the goose's foot, which proved that he was really not dead, but was trapped. In this way, Xiongnu Khan could no longer lie that Su Wu was dead and had to put him back in the Han Dynasty. Since then, the story of "Hongyan Legend" has become an eternal story. And Hongyan has become a messenger.
5. Drumming sound
Drumming and transmitting sound, the earliest style of military communication hall in China, is enough to transmit military information to the Song Dynasty with drums, which has been used since the Shang Dynasty.