Bally's achieved his greatest success at the 1950 European Championships in Brussels, where he won gold in the 100 metres and silver in both the 200 metres and the 4x100 metres—he ran the first leg of the final and was followed by Jacques Perlot, Yves Camus and Jean-Pierre Guillon. His final major championships were the 1952 Olympics in Helsinki, where he reached the quarter finals of both the 100 metres and the 200 metres and finished fifth in the final of the 4x100 metres.