Соответствующая норма
Germany
Practice Relating to Rule 47. Attacks against Persons Hors de Combat
Section C. Quarter under unusual circumstances of combat
Upon ratification of the 1977 Additional Protocol I, Germany stated that it understood the word “feasible” to mean “that which is practicable or practically possible, taking into account all circumstances ruling at the time, including humanitarian and military considerations”. 
Germany, Declarations made upon ratification of the 1977 Additional Protocol I, 14 February 1991, § 2.