There is not much information about him. So, you take liberties in terms of the understanding. Some photographs are there which helps you build one side of it. There are some letters of him which again help. There are some letters and the court case of him which helped me to build the character. All the evidence is available after the incident at Caxton Hall. There is nothing available as to what his life was like before that. This happened in 1940 and within three- or four-months a court case happened and he was hanged. Before this incident nobody knew who he was and where he was before the Caxton Hall incident. So, with these photographs, pictures, letters and small anecdotes, a few survivor stories of the Jallianwala Bagh tragedy helped us to stitch together the story of Sardar Udham Singh.