There were (four) ways for the ancients to transmit information.

The ancient methods of transmitting information are as follows:

[1] Feather stick: Feather letters are mostly used in war emergencies. Advantages: fast disadvantages: think for yourself.

[2] Chicken hair letter: generally used in folk.

[3] Feather book: used for conscription.

[4] Carrier pigeons send books [so-called flying pigeons send books]. Migratory birds, especially pigeons and geese, are used as communication tools.

[5] Fast horses pass books. Post-horse relay is an early organized mode of communication.

[6] Bamboo tube: dual-purpose for government and people, similar to the current envelope.

[7] Rapid transmission: used to transmit urgent military information, commonly known as "passing the gold medal".

[8] Different dynasties, such as bonfires/wolf smoke, have different modes of transmission.

[9] Use special sounds, such as bells, drums and firecrackers.

[10]. Ways to make stuffing, such as Tibetan fish belly, cake, steamed bread, etc.

There are also semaphores, lanterns and other ways to convey information.

Mainly use the following methods: flying pigeons, bonfires, fast horses, code words, sign language, letters, flags and so on.