Smoke signals came out of a forest in Vietnam in 1968.

the smoke signals said "HELP! HELP! WE ARE CITIZENS AND WE NEED FOOD AND WATER" shortly after, a team was sent to the village to see what was going on there but when they got there there was only wooded area and then they heard something coming from the bushes. No one understood the language but they said this: "trên 3 chúng tôi tấn công tất cả" when they saw a soldier: "số ba" and then Vietcong soldiers came out of all the bushes and trees with their rifles and bayonets, shooting and stabbing every soldier down. And not even another team came to see if the soldiers were okay!