On a hill above the road from Lavkies to Demene on the right side of the road 1 km before Derwaniszki stands a two-metre-high reinforced concrete legion cross with a Polish-Latvian inscription on a plaque: "The grave of Polish soldiers killed in 1919-1920 for the independence of Latvia". This cross was erected in 1997 by the Council for the Protection of Struggle and Martyrdom Remembrance near the grave of unknown Polish soldiers. Perhaps one of the fallen was Sergeant Jan Sieńko of the 23rd pp, who was killed in Derwaniszki on 26.10.1919. However, there is no information on the exact location of his burial place. The last conservation of the object was carried out in 2019 by the Foundation Helping Poles in the East, as part of a task co-financed from the programme of the Minister of Culture and National Heritage 'Sites of National Remembrance Abroad'.