In international play, Harry played lead for Stjerne at the 2010 European Curling Championships, and made the playoffs, where they defeated Germany and Switzerland to play Norway in the gold medal game. Norway's Thomas Ulsrud won a close game over Stjerne, leaving him the silver medal. The next year, at the 2011 European Curling Championships, the team again made the playoffs, but lost in an extra end in the page 3 vs. 4 game to the Czech Republic, relegating him to the bronze medal game. However, Denmark defeated the Czech Republic in the bronze medal game.