On the night of 27 December 1941, Tadeusz Chciuk took part in Operation "Jacket," in which a small group of special agents (called Cichociemni, literally "The Silent Dark Ones") parachuted into Poland. He was sent as an emissary of the Polish Government in Exile, which was led in London by General Wladyslaw Sikorski. His code name was "Celt," actually an anagram of his initials and those of his fiancee, Ewa Lovell. His mission was to make a report to the General on the state of the Polish underground. He spent several months in Poland making a detailed assessment of the situation. In addition to meetings with the Chief Delegate (the acting head of the government) and political and underground leaders, he also smuggled himself into the Warsaw Ghetto and witnessed horrifying scenes. Owing to the many challenges involved with getting back to London through German-occupied Europe, it took him a whole year to get back with his report. During his travels (via Hungary, Croatia, Switzerland and France), he took on a series of disguises, including wearing a full Roman Catholic priest's garb and claiming to be the Hungarian priest Andor Varga, and claiming to be a French railroad maintenance worker. He was captured by the Spanish Guardia Civil while crossing into Spain from Andorra, and was held in jail in Gerona until he was transferred to a concentration camp in Miranda de Ebro. There was a raging epidemic of yellow fever at that camp, and Tadeusz made his escape when an inmate who had qualified for release died, and he claimed to be that guy. He made his way to Gibraltar and was flown back to London. Tragically, General Sikorski died in a plane crash while departing Gibraltar himself en route to London. Upon his return to Great Britain in June 1943, Tadeusz Chciuk submitted his report to the military authorities. He was one of the first agents to return with first-hand accounts of the systematic and total extermination of Poland's Jewish population by the Germans. He was awarded Poland's highest military distinction, the Virtuti Militari, for outstanding valor.