[1] After the besieged city had been liberated, he returned home and volunteered for the Polish Army at the outbreak of the Polish-Soviet War.

[2] After the Polish conflicts for the borders ended, Korboński passed his matura exams and joined the Adam Mickiewicz University of Poznań, where he graduated from the faculty of law.

[3] Prior to the outbreak of World War II he was mobilized for the Polish Army and commissioned to the 57th Infantry Regiment in the rank of First Lieutenant.

[3] He help found the Polish underground as an active member of the Union of Armed Struggle (ZWZ) and then the Armia Krajowa.

Supported by most parties, already in April of the following year he became the chief of the Directorate of Civil Struggle, the agenda of the Polish government responsible for the coordination and organization of civilian resistance, information and propaganda.

During his term at the office, Korboński also extended the responsibilities of the Directorate by including maintaining law and order, organizing a net of underground civil courts and coordinating carrying out their verdicts by the National Security Corps.

[6][7][8] Released from Soviet prison following the creation of the communist-controlled Provisional Government of National Unity, he returned to the bar and active political career within the reactivated Polish People's Party, the most popular party in Poland at the time and the main opposition force to the Soviet-backed communist regime.

[11] Korboński also became a noted journalist, a head of the Polish Council of Unity and a member of the International PEN Club.

Among other awards, in 1973 he received the Alfred Jurzykowski Prize and in 1980 the Yad Vashem Institute granted Korboński with the Righteous Among the Nations medal.