No One's Child (2014)

The movie is based on the fascinating, true story of a feral boy whom hunters found among wolves in a forest in the mountains of Bosnia-Herzegovina (BiH) in the mid-1980s. The boy was sent to the institution for children in an attempt to socialize him and got the Muslim name – Haris. Contrary to most predictions, he was developing and making friends quickly. When the war in BiH broke out in 1992, Haris got the letter from local Bosnian authorities which asked for his immediate return. Upon returning to BiH, he had nowhere to go. While wandering aimlessly, he came across a group of soldiers that gave him a gun and took him with them

Source: TMDb