The son of Waclaw's sister, Paul Hur, finished the Polish Air Force Academy in Dęblin and took part in Battle of Britain.

[4][5] After their mother was murdered by the Gestapo in Białystok, together with her sister Wiesława, Danuta joined the Home Army in late 1943 or early 1944.

She was liberated from a prison transport convoy by a patrol of a Wilno group of ex-Home Army partisans commanded by Stanisław Wołonciej "Konus", a subordinate of Zygmunt Szendzielarz, "Łupaszko", who were operating in the area.

For a short period, her superior was also lieutenant Leon Beynar "Nowina", deputy of "Łupaszko", later known as "Paweł Jasienica" - a notable Polish historian and writer.

However, the testimony submitted by MO and UB members involved in the fight was at best contradictory, as some claimed to have seen her shooting and giving orders, while others denied it altogether.

Siedzikówna was executed (along with Feliks Selmanowicz, whose nom de guerre was "Zagończyk"), six days before her 18th birthday, on 28 August 1946, in a Gdańsk prison.

When the prosecutor gave the order for the execution squad to fire, both prisoners simultaneously shouted (in Polish) "Long Live Poland!"

She remained alive and the coup de grâce was delivered by Franciszek Sawicki (other members of the firing squad refused to do so)[4][10] after she yelled "Long live Łupaszko!

"[12] Her Protocol of Execution was signed by: Major Wiktor Suchacki (prosecutor), 2nd Lt. Franciszek Sawicki (firing squad leader), Captain Mieczysław Rutkowski (attending physician), and Jan Wójcik (jail warden).

On 28 August 2016, a state burial attended by President Andrzej Duda,[15] was held in Gdańsk at the Garrison Cemetery for Siedzikówna and one of her companions.

[10] After the fall of communism in Poland, the main Stalinist prosecutor in Danuta's trial who demanded the death penalty, Wacław Krzyżanowski, was brought up on charges of judicial murder twice (in 1993 and 2001).

)[10] On Polish Independence Day (11 November) 2006, President Lech Kaczyński posthumously awarded Danuta Siedzikówna the Officers's Cross of the Order of Polonia Restituta.

[18] In 2017, the National Bank of Poland (NBP) introduced a 10-zloty silver commemorative coin, as part of the "Cursed Soldiers" series, in honour of Danuta Siedzikówna.

[21] In 2012, Polish hip-hop artist Tadek released a single "Inka" on his album Niewygodna prawda ("Inconvenient Truth") to pay tribute to the memory of Danuta Siedzikówna.

[23][24] In 2000, Tomasz A. Żak, working for the Nie Teraz Theatre, directed a stage play entitled Na etapie dedicated to the life of Danuta Siedzikówna.