Boys dressed in 1944 upraisers' uniforms, were selling flags with symbol of Fighting Poland (called also "Kotwica", Anchor) at the ceremony to give tribute to Warsaw Uprisers.
The Warsaw Uprising began on August 1, 1944 and continued for 63 days (until October 2).
It was a World War II struggle by the Polish Home Army (Armia Krajowa) to liberate Warsaw from German occupation.
Polish losses amounted to 18,000 soldiers killed and 25,000 wounded, in addition to between 120,000 and 200,000 civilian deaths, mostly from mass murders conducted by retreating German troops.
German casualties totalled over 17,000 soldiers killed and over 9,000 wounded. During the urban combat approximately 25% of Warsaw's buildings were destroyed.