The memorial, in the western village of Mikuliszki, consisted of the remains of the wartime headquarters of a Polish Home Army unit whose members died in combat in the area in 1944.
Another 1,000 volunteers commenced basic military training on Monday across Poland, the defence minister has announced on Twitter.
Murdered by communists in Lublin Castle in 1949, the whereabouts of Henryk Wieliczko’s body remained unknown for six decades.
Found hidden in a shoebox by the soldier’s grandson, the majority of the 69 previously unseen photographs in the collection depict the life of the German occupiers in Lublin, showing amongst others their daily work, life in the barracks, integration events and walks through the city.
Mariusz Blaszczak, the Polish defence minister, inaugurated the first training session of a new volunteer force, comprised of people who have signed up for basic military service, set up in response to Russia's aggression against Ukraine.
Poland's defence minister has said that while modern weaponry is important, it is more important for an army to have a large number of soldiers.
Mariusz Błaszczak, the Polish defence minister, on Saturday inaugurated voluntary basic military service, which the government introduced in response to Russia's aggression against Ukraine.
Boris Johnson, the British prime minister, has confirmed that Ukrainian soldiers are being trained in Poland as well as the UK in the use of military equipment being sent to them.
Mateusz Morawiecki, the Polish prime minister, has said that Poland is ready to provide hospital treatment to at least 10,000 injured Ukrainian soldiers.
With the blessing of their parents, the 18-year-old identical triplets have joined Poland’s Territorial Defence Forces amid an enlistment surge following Russia’s invasion of Ukraine.