Whether you have seen the "Romance of the Three Kingdoms" or not, people must be very familiar with Zhuge Liang's name. In the book, he is a scheming courtier, his straw boat borrows arrows, and the three Gu Maolu are all exposed to since we were young. At the same time, he is also a person who is good at creation, Zhuge Lian crossbow, wooden cow and flowing horse, etc. are all created by Zhuge Liang. But do you know that zhuge liang's creation is now used by traffic police?
Now it can be said to be a major killing weapon of the traffic police, and this invention saved 100,000 soldiers and horses of the Shu kingdom before Zhuge Liang died. But to talk about this invention, we also have to start with Zhuge Liang's last Northern Expedition. At that time, Zhuge Liang was anxious to attack the State of Wei, and the cunning Sima Yi had been delaying Zhuge Liang with a strategy of resisting the enemy. Zhuge Liang camped in Wuzhangyuan, but the long-term consumption made the grain and grass in the camp insufficient to support the long-term stationing. Therefore, in order not to spend time with Sima Yi, he could only use schemes to obtain it. Zhuge Liang sent Sima Yi women's clothes only to provoke Sima Yi, but Sima Yi was not deceived, and even wore women's clothes to show Zhuge Liang.
In this way, Zhuge Liang really had no choice but to temporarily garrison Sima Yi in Wuzhangyuan to see if there was any chance to attack Sima Yi later. Zhuge Liang had no choice but to send troops to Tun Tian and Sima Yi to spend all the time, but in the process of this day and day, Zhuge Liang's body was worse than a day, and finally Zhuge Liang knew that his limit had arrived, so he had to withdraw his troops back to shu. Zhuge Liang knew that he had withdrawn his troops, and Sima Yi certainly would not let him go easily.
Zhuge Liang had long anticipated this, so he invented the horse nail. This nail is centered on a small ball with 4 small spikes around it, one of which is pointed upwards. Zhuge Liang was filled with this nail on the way to retreat, so when Sima Yi led his army in pursuit, he was injured by this nail. The cavalry pursued by Sima Yi suffered numerous casualties. When Sima Yi adjusted and prepared to continue the pursuit, the Army of the Shu State had long disappeared, and eventually Zhuge Liang successfully escaped
With this nail, Zhuge Liang allowed the Shu kingdom, which should have been more dead and injured, to return to his camp safely. Now this nail is still used in military operations, and the nails sprinkled on the ground when the traffic police are now chasing vehicles are also based on Zhuge Liang's station nails. As long as the tires of the car passing through the barricade have been hit by this nail, the car cannot continue to walk immediately.