The landmark battle is believed to have saved Poland’s newly regained independence after the end of World War I and prevented the Bolshevik revolution from spreading into western Europe.
Many say the battle, often described as the “Miracle of the Vistula,” was one of the world’s most important.
The battle was fought from August 12 to 25 in 1920 as Red Army forces commanded by Mikhail Tukhachevsky approached the Polish capital.
Polish forces headed by military leader and chief of state Józef Piłsudski counterattacked, forcing the Soviets to withdraw.
A host of top officials on Friday attended a ceremony to open a new museum in Sulejówek near Warsaw that documents Piłsudski’s life.
On Saturday, military airplane and helicopter pilots are at midday expected to perform flyovers and pay tribute in 14 cities to Poles who fought in the Battle of Warsaw.
Polish and American F-16 fighter jets are set to appear in the skies above the capital, flying over a square named after Piłsudski.
A large-scale military parade in Warsaw that was to have been a highlight of events marking the 100th anniversary of the 1920 battle has been called off amid a spike in COVID-19 cases.
A special website focusing on the historic battle 100 years ago and using recordings from Polish Radio archives was launched in the run-up to the centennial, at bitwa1920.gov.pl.
Public broadcaster Polish Radio has issued a two-CD album to mark the centenary of the battle.