The 1st and 3rd Infantry Divisions of the Legions - regiments: 5, 6 and 9 - took part in the battles against the Bolsheviks, which took place in the area of Solonay and Jankiszki on 12 September 1919. The "List of Polish Army Losses" published in 1934 by the Military Historical Office gives the names of 5 soldiers who fell in "Janiszki" on 12 September 1919. They are legionary privates from the 9th Legion Infantry Regiment: Jan Świniarski, Konstanty Tymiński, Stefan Wilk, Władysław Wozignuj, Marian Stępczyński. However, a search in the materials of the Lithuanian Central State Archive for confirmation of their resting place in Jankiškės did not yield the expected results - the lists of the buried do not contain any names of soldiers resting in Jankiškės, only information about 11 unknown soldiers. The Polish soldiers' grave is located in the local cemetery to the left of the entrance, in the fourth row of graves. In 1997, the Council for the Protection of Struggle and Martyrdom Sites cleaned it up by erecting a two-metre-high reinforced concrete legion cross, modelled on the crosses placed on the graves of soldiers killed in the Polish-Bolshevik war. A black stone plaque with an inscription in Polish and Latvian is placed on the cross, at the crossing of the arms: "The grave of Polish soldiers killed in 1919-1920 for the independence of Latvia". In 2019. Foundation Aid to Poles in the East, within the framework of the task subsidised by the programme of the Minister of Culture and National Heritage "Places of National Remembrance Abroad", carried out repair and conservation works on the grave.