Соответствующая норма
Germany
Practice Relating to Rule 47. Attacks against Persons Hors de Combat
Section A. General
Germany’s Law Introducing the International Crimes Code (2002) punishes anyone who, in connection with an international or a non-international armed conflict, “wounds a member of the opposing armed forces or a combatant of the adverse party after the latter … is … placed hors de combat”. 
Germany, Law Introducing the International Crimes Code, 2002, Article 1(8)(2).
According to the Report on the Practice of Germany, the right to be given quarter is for the benefit of every person. 
Report on the Practice of Germany, 1997, Answers to additional questions on Chapter 2.1.