Bollywood`s action hero Ajay Devgn said that his forthcoming movie titled `Sons Of Sadar` is a tribute to the warriors of Battle of Saragarhi. The movie tells the story of the 21 Sikhs who fought to death in the 1897 Battle of Saragarhi. Details about the film are yet unknown. Devgn is currently busy with his directorial venture `Shivaay`, which is slated to release this Diwali.