The soldiers wrote about their experiences in around 600 letters when they were in hospitals, records of which are maintained in the Haryana Academy of Art and Culture.
“Soldiers used to send one rupee from their monthly salary to the academy, which went towards education of students,” says the filmmaker.
Singh says he researched for the past three years for the film, which is set to be made in various languages and would be produced by France Television.
The glimpses of the footage which the director showed in the programme were a product of a three-year-long research.
