In 1939, after invading Poland, the Nazi German occupation forces closed the university. Able-bodied males were required to work, so from 1940 to 1944 Wojtyła variously worked as a messenger for a restaurant, a manual labourer in a limestone quarry and for the Solvay chemical factory, in order to avoid deportation to Germany. In February 1940, he met Jan Tyranowski who introduced him to the Carmelite spirituality and the "Living Rosary" youth groups. In that same year he had two major accidents, suffering a fractured skull after being struck by a tram and sustaining injuries which left him with one shoulder higher than the other and a permanent stoop after being hit by a lorry in a quarry. His father, a former Austro-Hungarian non-commissioned officer and later officer in the Polish Army, died of a heart attack in 1941, leaving Wojtyła as the immediate family's only surviving member. "I was not at my mother's death, I was not at my brother's death, I was not at my father's death," he said, reflecting on these times of his life, nearly forty years later, "At twenty, I had already lost all the people I loved."