Le vieux fusil (English title: The Old Gun or Vengeance One by One) is a 1975 French-West German war drama film directed by Robert Enrico, and starring Philippe Noiret, Romy Schneider and Jean Bouise.

In Montauban in 1944, during the Invasion of Normandy, Julien Dandieu a pacifist surgeon and convinced humanist, leads a comfortable middle class life with his wife Clara and his daughter Florence, born from a previous union.

Worried about the advances of German troops entering Montauban, Dandieu asks his friend Francois to drive his wife and his daughter to the remote village where he owns a château.

Alerted by the Resistance, the inhabitants of a nearby village and a company of American soldiers arrive to collect the dead.

Dandieu is picked up by Francois, but has suffered a nervous breakdown following the aftermath of the slaughter, behaving as if his family was still alive.