Capelle was a great striker in the 1930s. Capelle came into the national team as a 17-year-old. He was a calculating player rather than a purely physical one. As striker at Standard, he was the undisputed leader of the Walloon national team players. His biggest achievement with the Red Devils occurred in Copenhagen when he helped the team come from 3-0 behind to win 3-4. He was selected for the 1934 and 1938 World Cups, but only played in 1934.