[2] He came back to Poland in 1949 on the promise of military leadership with LWP,[1] only to be arrested and falsely accused of conspiracy against the party by the Stalinist secret police (Urząd Bezpieczeństwa).

Subsequently, Tatar was tried and sentenced to life imprisonment in the so-called Trial of the Generals, but released from prison during Polish October of 1956.

Having finished numerous officer courses, in 1934 he became one of the tutors of artillery tactics at the Higher War School (Wyższa Szkoła Wojenna) in Warsaw.

After the Polish defeat he evaded being captured by the Germans and Soviets and joined the newly formed Związek Walki Zbrojnej (ZWZ), the biggest resistance organisation, that eventually transformed itself into the Home Army.

[2] In July 1947 Tatar organized the secret transfer to Poland from the London-based Polish government-in-exile of the treasury of the prewar Fund of National Defense (Fundusz Obrony Narodowej, FON).

Already in 1945 on advice of Jerzy Putrament, Tatar gave Polish communists 100,000 dollars and a hundred gold coins stolen en route to Poland by consul Sobolewski who vanished.