On the night of 22 May, Sen was in action as the member of a wiring party that was heavily bombarded. Sen was hit in the leg by a shrapnel. When he was being dressed up, he was hit again in the neck and he died instantly. He was buried at the Sucrerie Military Cemetery in Colincamps in Somme, France. His personal items were sent to his brother in India who later donated them to the Institut de Chandernagore in Chandannagar.