Règle correspondante
Practice Relating to Rule 47. Attacks against Persons Hors de Combat
Section B. Specific categories of persons hors de combat
Poland’s Penal Code (1997) punishes anyone who “kills … persons who, having laid down their arms or having no longer means of defence, have surrendered at discretion”. 
Poland, Penal Code, 1997, Article 123(1)(1).