Tadeusz Pełczyński

[2] He completed a military course conducted by Zygmunt Zieliński, a future Polish Army generał broni (lieutenant general).

[2] In March 1918, after release from internment, he took up work at a social-services agency (Rada Główna Opiekuńcza) while continuing his involvement with "Zet."

[2] His tenure as chief of Section II had reportedly been ended by his wife Wanda's political activities against Marshal Edward Śmigły-Rydz and General Felicjan Sławoj-Składkowski.

Pełczyński may have made his greatest contribution to Allied victory in World War II well before the opening of hostilities, when he proposed giving Polish knowledge of the German Enigma machine to the French and British.

That was the basis of [Lt. Col. Langer]'s instructions... when he... represent[ed] the Polish side at the [Paris] conference... in January 1939 and then in Warsaw in July 1939.

Former Bletchley Park mathematician-cryptologist Gordon Welchman later wrote: "Ultra would never have gotten off the ground if we had not learned from the Poles, in the nick of time, the details both of the German military... Enigma machine, and of the operating procedures that were in use.

After the conclusion of the September Campaign, he went to Warsaw to take up underground work with the Service for Polish Victory (Służba Zwycięstwu Polski), then with the Union for Armed Resistance (Związek Walki Zbrojnej, or ZWZ) and the Home Army (Armia Krajowa, or AK).

[2] He commanded sabotage operations carried out by Kedyw units against the German war machine (including disruption of several rail lines).

[2] Five weeks into the Warsaw Uprising, on 4 September 1944, Pełczyński was gravely wounded when the PKO savings-bank building on Świętokrzyska Street was bombed, and as a result he could no longer carry on the duties of Home Army chief of staff.