The 9 deadliest Viet Cong booby traps that took the U.S. by surprise in Vietnam

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The Vietnam War is infamous for the guerrilla warfare tactics that left American forces largely unprepared. The Viet Cong effectively leveraged their home-field advantage, skillfully designing and deploying booby traps. These traps were not only economical but also ingeniously crafted from bamboo, a material that avoided detection by the U.S. military’s mine detectors.

Designed to maim rather than kill, the traps forced American troops to care for their injured comrades, slowing their overall progress. This tactic was further reinforced by secondary traps targeting those aiding the wounded. Reports alleged that traps and mines were responsible for 11 percent of deaths and 17 percent of troop injuries from 1965 to 1970, with an astounding 70 percent of injuries in 1965 attributed to these devices.

Beyond their physical toll, these booby traps inflicted major psychological damage, deeply undermining soldiers’ morale. Already contending with the harsh jungle environment, they had to maintain constant vigilance against the Viet Cong’s expertly concealed traps.

Bow trap

US Marines watching for Viet Cong snipers. (Photo Credit: Bettmann / Getty Images)

The bow trap was a simple, yet effective booby trap employed by the Viet Cong during the early days of the Vietnam War. A bow, pulled taut and prepped to launch, was attached to a tripwire. When an American soldier set it off, the bow released right where they were standing, resulting in a direct hit to the middle of the body.

Additionally, the some guerrillas set up this type of trap within a small pit. In these instances, the bow was angled upward, so the projectile would strike the enemy in the lower extremities.

Punji sticks

Lt. Don Burchell makes his way through punji sticks placed in a drained canal by the Viet Cong. (Photo Credit: Bettmann / Getty Images)

Punji sticks, also known as punji stakes, were a common booby trap deployed by the Viet Cong. The sharpened bamboo, wooden and sometimes metal stakes were often coated in feces or urine, with the goal of causing an infection in their victim. They could also be coated with poisonous substances from animals and plants. 

Punji sticks were placed pointing upright at the bottom of a hole, before being covered with material that would camouflage them. When a US soldier broke through the flimsy cover over the hole, they would step on the spikes at the bottom and suffer injuries to their feet and legs.

This particular booby trap could be made worse in two different ways. The first was installing them at a downward angle, along the sides of the hole. When these extra stakes were added, it became difficult for the victim to get themselves out without causing further injury to themselves. This often resulted in the slowing down of their unit while efforts were made to free them.

A second way was by digging another hole next to the one equipped with the punji sticks, with the aim being to trap a second combatant with little additional effort. When a soldier came to rescue his injured comrade, he’d fall into the adjacent hole and become trapped.

Along with physically injuring American troops, punji sticks were also effective at hurting the overall morale of those serving within Vietnam’s dense jungles.

Bamboo whip

173rd Airborne Division troops scaling Hill 875. (Photo Credit: Bettmann / Getty Images)

Bamboo whips were another cruel booby trap used by the Viet Cong. A bamboo pole, pulled back under high tension, was connected to a tripwire. The pole was outfitted with foot-long spikes, and when the tripwire was triggered, it would snap forward, impaling the person who set it off.

As reported by We Are The Mighty, the pole and its spikes could reach speeds of up to 100 MPH. Similar to punji sticks, the spikes could be coated with toxic substances to weaken the victim’s ability to recover.

Swinging mace

Spiked ball used by the Viet Cong as a booby trap during the Vietnam War. (Photo Credit: Pictures From History / Universal Images Group / Getty Images)

The swinging mace functioned in much the same way as the bamboo whip, but instead of being connected to a stick, the spikes were embedded in a 24-inch ball made of clay, wood, or metal, which was activated by a tripwire. The ball typically weighed over 40 pounds.

This was among the more brutal tactics employed by the Viet Cong. When the concealed ball was triggered, it harnessed the force of gravity to swing down from a tree, causing devastating injuries to a soldier’s upper body, particularly targeting the head and upper torso.

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Tiger trap

Viet Cong guerrillas around a model of the Bến Cầu fortress, near Tây Ninh province, during a briefing for an attack during the Vietnam War. (Photo Credit: Bettmann / Getty Images)

The tiger trap was another Viet Cong booby trap that, like the swinging mace, caused significant injury to a soldier’s upper body. The trap was sprung when the intended victim triggered a tripwire, causing a wooden plank imbued with metal spikes to fall on them.

This was made all the more brutal by the addition of weighted bricks or other objects on the board.

Snake pit

American soldiers shoveling dirt into the entrance of a tunnel believed to have been used by the Viet Cong. (Photo Credit: Bettmann / Getty Images)

Snake pits were primarily used within the Viet Cong’s tunnel systems.

A poisonous snake would be attached to a piece of bamboo, and when released on the victim would place the reptile in the perfect location to attack. Snake pits were encountered by American “tunnel rats,” but the Viet Cong would put snakes in other locations, too, such as in their bags or in old weapons caches.

Bamboo pit vipers were a common snake used by the Viet Cong. Within a few minutes of being bitten, the flesh surrounding the bite turned necrotic, swollen and extremely painful. However, the Malayan krait was the most infamous, earning the nickname, the “two-step snake,” sometimes mischaracterized as the “three-step snake.” This is rooted in a myth that a soldier bitten by one was killed in the short time it took him to move two steps.

Cartridge trap

Viet Cong soldiers moving forward, under covering fire from a heavy machine gun, during the Vietnam War. (Photo Credit: Three Lions / Hulton Archive / Getty Images)

Cartridge traps operated in a similar way to punji sticks, in that they were placed within a hole in the ground. An ammunition round would be set within a tube made from bamboo, with a nail and wooden board placed underneath to act as a mock firing pin. Camouflage was then placed overtop to prevent enemy soldiers from detecting it in advance.

When they stepped on the booby trap, the soldier’s weight would activate the ammunition and fire it through their foot. As such, these were sometimes called “toe-poppers.” The extent of the injury was largely based on the size of the shell. Smaller ones often left men permanently disabled, while larger shells were fatal.

Grenade-in-a-can

US Army instructor showing a recruit how to deactivate a tripwire used by the Viet Cong. (Photo Credit: Underwood Archives / Getty Images)

As the name indicates, the grenade-in-a-can was constructed by placing a grenade, with its safety pin removed, into a can, which held down the striker lever. A tripwire was then attached and, when tripped, would pull the explosive out of the can and cause it to detonate. 

This type of trap could either be constructed with a single can and a stake, or with two. If two cans were used, they were mounted on trees on either side of a path, with the tripwire running between them. These booby traps were typically positioned in a stream and along the entrances to the Viet Cong’s tunnels.

Rigging war trophies

Members of the US 1st Cavalry Division patrolling near the Cambodia-South Vietnam border. (Photo Credit: Toshio Sakai / UPI / Bettmann / Getty Images)

These booby traps were created based on the fact that American troops enjoyed capturing the flags of their enemies. When Viet Cong guerrillas were forced from their bases, they’d rig their flags with explosives, which detonated when the US soldiers took them down. 

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The Viet Cong knew the Americans also enjoyed taking other items as war trophies. As such, they rigged them with similar explosives, so that, if the enemy combatants wanted to take anything from abandoned camps, the explosives would detonate, causing additional casualties. 

Rosemary Giles: Rosemary Giles is a history content writer with Hive Media. She received both her bachelor of arts degree in history, and her master of arts degree in history from Western University. Her research focused on military, environmental, and Canadian history with a specific focus on the Second World War. As a student, she worked in a variety of research positions, including as an archivist. She also worked as a teaching assistant in the History Department. Since completing her degrees, she has decided to take a step back from academia to focus her career on writing and sharing history in a more accessible way. With a passion for historical learning and historical education, her writing interests include social history, and war history, especially researching obscure facts about the Second World War. In her spare time, Rosemary enjoys spending time with her partner, her cats, and her horse, or sitting down to read a good book.
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