Polish President Andrzej Duda took part in an early morning ceremony in Westerplatte, near Gdansk, on Tuesday to mark the 81st anniversary of the outbreak of World War Two.
Polish Defence Minister Mariusz Blaszczak announced on Friday that this year's observances of the outbreak of WWll will be organised by the Polish Army on September 1 at Westerplatte, northern Poland.
Scientists at Pomeranian Medical University in Szczecin are studying four skulls to try to determine where the men came from in biogeographic terms, their eye colour and hair colour.
The discovery of the remains of the unknown soldier follow the unearthing of two more skeletons in recent weeks.
The soldier whose remains were discovered this week may well have died on 2 September, on the second day of the attack, during shelling by German aviation, Polish authorities have suggested.
TFN looks back at one of the first battles of Second World War: the fight for the Polish post office in Gdańsk.
"From Westerplatte, I'm calling on all my compatriots - those who support us and our opponents - to walk together in the Independence March on November 11, PM Mateusz Morawiecki said at observances of the 79th anniversary of the outbreak of World War II.