In the Catholic cemetery in Dyneburg, near the so-called "Tomb of the Unknown Soldier", there is a grave of a Polish officer of unknown name killed or dead during the 1920 Latgalian campaign. A small concrete cross and an earth-filled border have been preserved. In 2021, the Foundation Aid to Poles in the East, within the framework of a task subsidised by the programme of the Minister of Culture and National Heritage "Sites of National Remembrance Abroad", carried out probing and archaeological work at this grave. As a result of the research, it was found that a Polish Army lieutenant of undetermined personalities rests here. The Ministry of Culture and National Heritage plans to arrange this grave accordingly.