On 7 October 1938, he participated in the Rosary demonstration , a demonstration in which 6,000 Catholics came together for a rosary devotion in protest of the Nazi occupation of Austria. The next day, Nazi soldiers stormed and vandalized the Episcopal Palace in Vienna, and Jachym was injured in the violence that ensued. On 10 May 1947, Jáchym earned habilitation, and in 1949 he was appointed professor of Catholic moral theology at the University of Vienna.