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In ancient times, the transmission of documents relied on post stations, generally every 20 miles there was a post station, once the official document that needs to be transmitted is marked with the words "immediately fly", it must be transmitted at a speed of 300 miles per day according to the regulations.

Eight hundred miles expedited.

In ancient times, the transmission of documents relied on post stations, generally every 20 miles there was a post station, once the official document that needs to be transmitted is marked with the words "immediately fly", it must be transmitted at a speed of 300 miles per day according to the regulations.

In the event of an emergency, the speed of transmission can reach 400 miles, 600 miles, and as fast as 800 miles per day.

Eight hundred miles expedited is the speed expressed = eight hundred miles of days in China's vast territory, so in order to facilitate contact, the ancient dynasty established a system of information in the form of post transmission, and the Western Zhou Dynasty has produced a system of post post transmission. In the Tang Dynasty, "one post passed another, and the post rode like a stream of stars", and through the fast stagecoach, the lychees of Lingnan were sent to Chang.

In fact, it can't reach the speed of 800 miles a day.

In ancient times, there was generally a post station every twenty miles, and once the official document to be delivered was marked with the words "immediately fly", according to the regulations, three hundred miles per day, and in case of emergency, it could be four hundred miles, six hundred miles or even eight hundred miles a day.

Therefore, in fact, the post guards are fast horses and whips, running at the fastest speed, relying on a horse alone can not run the goal, to the next post station to change people and horses, and continue to pass.

In the fourteenth year of Tianbao, An Lushan rebelled in Fanyang, and Tang Xuanzong was in Huaqingchi, Lintong, the two places were separated by three thousand miles, and Xuanzong got the news within six days, which shows that the transmission speed reached five hundred miles a day. In the Tang Dynasty, one foot was a meter, and a mile was a meter. 500 miles is about 227 kilometers in modern times, which was a very fast speed at that time.

As for the eight-hundred-mile expedited, it may take almost two days to arrive.

In fact, the ancient 800-mile expedited is equivalent to the current special urgency, representing the military intelligence 100,000 urgent. Let's take a look at an example first, on November 9, the 14th year of Tianbao, An Lushan rebelled in Fanyang with 50,000 or 60,000 soldiers and horses.

3 All the ancient documents were transmitted by post stations, generally every 20 miles there was a post station, once the official document that needs to be transmitted is marked with the words "immediately fly", it must be transmitted at a speed of 300 miles per day according to the regulations.

In ancient times, the transmission of documents relied on post stations, generally every 20 miles there was a post station, once the official document that needs to be transmitted is marked with the words "immediately fly", it must be transmitted at a speed of 300 miles per day according to the regulations. In the event of an emergency, the speed of transmission can reach 400 miles, 600 miles, and as fast as 800 miles per day. When delivering emergency documents, each post station uses fast horses, so that although it is not a thousand miles horse, but each horse runs desperately, and it can also be a thousand miles a day, and the "eight hundred miles expedited" is used to indicate the transmission of information in an emergency.

In ancient times, the transmission of documents relied on post stations, generally every 20 miles there was a post station, once the official document that needs to be transmitted is marked with the words "immediately fly", it must be transmitted at a speed of 300 miles per day according to the regulations.