Thomas Bill Hardt, a German photographer who was born in 1937, went to many countries in the historic moments, including Vietnam. The main theme in his works is the children. This photograph captures a little girl carrying her younger brother on her back in the 60s-70s.

Each photo of Hardt is a testament to the horrors of war, and it makes the world speak out. In the picture is a Vietnamese boy hiding in the bunker.

This photo journalist recorded the tragic images of war in Vietnam, highlighting the fear on the faces of kids.

The girl in this picture did not dare to play far away from her bunker for fear of sudden bombings.

A baby in her mother's arms, who is a guerrilla. She could lose her mother’s breast milk any time because of the devastating war.

The babies crying, asking for their mothers.

This photo is shot at the National Ballet and Opera Theatre. A little girl was scared because she saw foreigners for the first time. The father comforted her. This photo appeared on the covers of many magazines around the world.

The eyes of kids before the lens of the German photographer.

Hardt recorded images of children in many countries around the world, such as kids in the famine in Bangladesh, their frightened eyes of death in the Balkans and Vietnam. This photo was taken in 1969 in northern Vietnam.

Since 1987, he has become an active member of many child protection organizations of the United Nations. A Vietnamese boy did math on a buffalo.

This photo – a buffalo boy playing a flute - was taken in the North in 1969.

Thomas came to Vietnam for the first time in 1960. After that trip, he came back again and again. From 1962 to 1985, he went to Vietnam 12 times, out of a total of 50 trips around the world. In the photo: North Vietnam in 1979.

A buffalo boy was running from rain.

In the wartime, children at 6, 7 had to work to support their families.

His photos are known worldwide and appeared in over a hundred of exhibitions from Moscow to New York. Many of them were used by famous magazines. This photo was taken in 1972.

In 1999, he organized the exhibition "Vietnam War" in Hanoi. In 2003, he returned to hold an exhibition at the Hoan Kiem Lake and to see the characters in his photos. He met with the one who obsessed him most: a female soldier named Hong Ly.

He also introduced the images of Vietnam to the world.