At the age of four and a half years he moved to Dessau, in 1895, where his father had received a position as professor in the Antoinette School, connected with a teachers' seminary. He had another year and a half of joyous play in this city. Then he was sent to school, and he owed his education to the Friedrichs gymnasium at Dessau, from which he graduated in the Easter of 1911. When he was three years old he had had a severe attack of whooping-cough. This had left a strong tendency to asthma, and was the cause of much trouble at school through illness. In fact, it was a weakness that plagued him with continual colds even to the last few weeks of his life. While still only a youth, he fought this weakness by practising long-distance running, and in 1913 he won second prize in the Army Marathon at Frankfurt. Aside from this, he was perfectly healthy and was always exercising to keep himself so. In his boyhood he learned how to swim while resting on the hands of his father, who was holding him in the waters of the Mulde River. In a few moments, to the amazement of the spectators, he was paddling around in the water like a duck. This is an example of his courage and self-confidence. In the same way he rapidly developed into a skilled, fearless mountain climber under the tuition of his father, when, as a seventeen-year-old boy, he was first taken on such trips. In the Tux district trips were taken from Lauersbach, and the more difficult the climb the more it pleased Oswald. Only when there was real danger was there any joy for him. His mother will never forget the time she witnessed his climbing of the Höllenstein. She was on the lower Krieralpe watching. When it was time to descend he, taking huge strides, fairly ran down the slope covered with loose slabs of stone and waited, standing on his head, for his more cautious father and his brother Martin.