Beginning filming in December 2010, the film features the experiences of Spanish people who took part in the war, namely General Antonio Velázquez who was at the time military medical lieutenant and Captain Ramón Gutiérrez de Terán (a nurse with the longest service time in the military medical group supporting southern Vietnam).

General Velázquez said that to avoid criticism for unilaterally waging war in Vietnam, the US asked some other countries to take part in invading Vietnam.

Thus, in 1965, US President Lyndon B. Johnson urged Francisco Franco, general, dictator and ruler of Spain from 1936-1975, to send military troops to the country.

According to some documents, after a fierce argument between the Minister of War and Minister of Foreign Affairs about the US proposal, Gen. Franco decided to send the army medical corps, who would not be directly involved in the fighting.

The first group of medical soldiers, including 4 doctors, 7 nurses and 1 officer in charge of military supplies, arrived in Vietnam in 1966 and worked at Truong Cong Dinh hospital in former southern Go Vap district.

From 1966-1971 three other groups, with nearly 30 people, were also deployed to work at the hospital.

To avoid publicly supporting the US, Gen. Franco ordered the medics to keep their activities in confidence. The medical soldiers, who had completed their mission in 1971, were told to remain silent.

The secret of the Spanish intervention in Vietnam was unveiled by journalist Alejandro Ramírez with his book, published in 2005, which was the basis for the filmmakers to produce this documentary film.

The film is part of a special programme on Vietnam shown on Historia channel in March. Other films on the Vietnam War and the important role of the late president Ho Chi Minh in the struggle for Vietnam’s freedom and independence were also screened.