Hacksaw Ridge is a 2016 American war drama film directed by Mel Gibson. The film tells the true story of Desmond Doss, an American pacifist combat medic who, as a Seventh-day Adventist Christian, refused to carry or use a weapon or firearm of any kind
From Wikipedia
A hacksaw is a fine-toothed saw, originally and mainly made for cutting metal. The equivalent saw for cutting wood is usually called a bow saw.