Baczynski debuted as a poet some time in 1938 in Strzała - a magazine published by the Organization of Socialist Youth Spartakus, to which he belonged himself.

After graduation, he wished to continue his education at Warsaw's Academy of Fine Arts, but the outbreak of World War II ended these plans.

During the German and Soviet (until 1941) occupation of Poland, he continued to work with the left-wing underground press, most notably with the "Płomienie" (Flames) and "Droga" (Way) magazines.

At the same time he was a student of Polish language at the secret underground Warsaw University and the Armia Krajowa's "Agricola" NCOs School.

As a member of Scouting Assault Groups (Harcerskie Grupy Szturmowe), Baczyński took part in many sabotage actions throughout the occupation.

His talent was highly appreciated by his contemporaries, Stanisław Pigon, upon hearing news of Baczynski joining the Szare Szeregi, said to Kazimierz Wyka: We belong to a nation, whose fate is to shoot at the enemy with diamonds.