Règle correspondante
Poland
Practice Relating to Rule 115. Disposal of the Dead
Section E. Grouping of graves according to nationality
Poland’s Procedures Governing the Interment of Soldiers Killed in Action (2009) states: “When selecting the burial site and digging the graves, the aim should be to ensure that: … [they] are grouped according to nationality”. 
Poland, Norma Obronna NO-02-A053:2004, Działania wojenne Procedury pochówku poległych i zmarłych, enacted by decision No. 134/MON related to the Approval and Enforcement of Regulatory Instruments in Respect of State Defence and Security, 21 April 2009, published in the Official Gazette of the Ministry of National Defence, No. 8, Item 99, April 2009, Section 2.2.
The Procedures also states: “Civilian members of the armed forces who had not participated in hostilities shall be buried in line with procedures established for the burial of the bodies of soldiers.” 
Poland, Norma Obronna NO-02-A053:2004, Działania wojenne Procedury pochówku poległych i zmarłych, enacted by decision No. 134/MON related to the Approval and Enforcement of Regulatory Instruments in Respect of State Defence and Security, 21 April 2009, published in the Official Gazette of the Ministry of National Defence, No. 8, Item 99, April 2009, Section 2.4.2.