The most terrifying thing in Vietnam was not the Vietnamese soldiers, but the women. These women, often disguised as weak and harmless, quietly kill people after attracting people to the bait. They were the Vietnamese female agents who frightened American soldiers. Vietnam can be said to be making the most of its use of women, and they know that their country is small, so they are inferior to those big countries in terms of military.
But they used all kinds of tricks. Few countries have been able to surpass Vietnam in the area of street fighting and female agents. After all, people have a connection with weak women, especially those who are more beautiful, and they are very popular. How could one think that a cute girl was actually a cold-blooded agent in disguise?
Depending on the client, the nature of the agent is also different. Ordinary young, some prettier female agents will dress up as runaway women and bait those American soldiers. More advanced will be mixed into the dance hall that the U.S. military often goes to, or the officers' club, and when they hold activities, they will launch attacks with their companions, and such attacks are generally larger in scale, and dozens of American troops can be killed on the spot. Moreover, even if they are older, these agents have a place to play. These older special unions disguised themselves as local petty traders and village women, who were old enough to do it well, and the U.S. military didn't care what a small trader on the street had in his hands.
These agents look like ordinary people, and they can't see their identities at all, so this is also the most headache for the US military. After all, you can't even distinguish between discrimination, so why attack and retaliate? In fact, the Vietnamese used the secret agent to the extreme, and in the self-defense counterattack war with China against Vietnam, they also used this method, killing many Chinese soldiers.
However Chinese also know how to distinguish between these agents in their long-term contact with them, especially Zhang Wannian, who had already realized that Vietnam was likely to go to war with China later during the war between the United States and Vietnam, so he had been thinking about how to solve the problem of female agents. And in the end he summed up 7 words. That's one look, two looks, three sniffs, what does that mean?
That is to say, when distinguishing whether they are female agents or not, the first thing is to lift their pants, they are soldiers, unlike ordinary women. Even civilians dressed up as civilians would wear military uniforms for the convenience of combat. The second is to look at their feet and see if there are any black and white marks on their feet. Because real women in Vietnam rarely wear shoes, female agents often need to wear thin sandals, and prolonged exposure to the sun will leave a mark on their feet. The third one is to smell whether they have gunpowder on their hands.
This method is very widely used and has successfully taught many people.