A Vietnamese tour guide shows a fascinating guerrilla warfare trick that helped the country to defeat America.

The slim man in green hat and top is seen disappearing inside a narrow tunnel before popping up behind the group ready to spring fire.

The huge network of connecting tunnels is still found in the dense jungle surrounding the Cu Chi District of Ho Chi Minh City.

Speaking to a group of tourists, the guide explains how Vietnamese forces would use the tunnels during combat.

He explains in the background that leaves were scattered on the ground for camouflage before the soldier would squeeze into a tiny hold and close the lid on top of them to hide.

Footage shows how the 'soldier' then reappears several yards behind the group where he could open fire undetected.

Speaking in the video, the tour guide says: "The U.S. Special forces like GI Joes, when they come here, they're very nervous because they disappear in front of you and when they look behind, they reappear with a gun and shoot you, so it's everywhere. Nobody knows where he will appear again. That's why they're called guerrilla soldiers.''

The tunnel in the footage is only one of the immense network of connecting tunnels located in the Cu Chi District, which saw action during the war.

The Cu Chi tunnels are part of a larger network of tunnels that underlie much of the region and foiled the Americans.

The controversial Vietnam war, the second-longest in U.S. military history, lasted from November 1, 1955, until April 30, 1975.

American forces eventually conceded defeat partly because they could not handle the Vietnamese soldiers' jungle warfare tactics.

The footage was captured on September 14.

A Vietnamese tour guide shows a fascinating guerrilla warfare trick that helped the country to defeat America.

The slim man in green hat and top is seen disappearing inside a narrow tunnel before popping up behind the group ready to spring fire.

The huge network of connecting tunnels are still found in the dense jungle surrounding the Cu Chi District of Ho Chi Minh City.

Speaking to a group of tourists, the guide explains how Vietnamese forces would use the tunnels during combat.

He explains in the background that leaves were scattered on the ground for camouflage before the soldier would squeeze into a tiny hold and close the lid on top of them to hide.

Footage shows how the 'soldier' then reappears several yards behind the group where he could open fire undetected.

Speaking in the video, the tour guide says: "The U.S. Special forces like GI Joes, when they come here, they're very nervous because they disappear in front of you and when they look behind, they reappear with a gun and shoot you, so it's everywhere. Nobody knows where he will appear again. That's why they're called guerrilla soldiers.''

The tunnel in the footage is only one of the immense network of connecting tunnels located in the Cu Chi District, which saw action during the war.

The Cu Chi tunnels are part of a larger network of tunnels that underlie much of the region and foiled the Americans.

The controversial Vietnam war, the second-longest in U.S. military history, lasted from November 1, 1955 until April 30, 1975.

American forces eventually conceded defeat partly because they could not handle the Vietnamese soldiers' jungle warfare tactics.