Under a law initiated by President Andrzej Duda and approved by parliament last year, December 27 is a public holiday in the country, known as National Day of the Victorious Greater Poland Uprising, in tribute to the revolt's participants in 1918 and 1919.
The Greater Poland Uprising, in which Poles rose against the German state after the end of World War I, erupted on December 27, 1918.
The revolt started after the region's German authorities opposed a visit to the city of Poznań by Polish pianist and independence activist Ignacy Jan Paderewski.
The insurgents demanded the release of Prussian-occupied Polish land as the country recovered its independence after 123 years of foreign rule.
Fighting continued throughout the region until January 1919.
The Greater Poland Uprising was one of just a few Polish insurgencies that ended in victory for the country.
(gs)
Source: IAR, PAP, IPN