 Two "Group" matches played under his stewardship were followed by the first semi-final between Argentina and the United States on 26 July 1930, which finished 6–1 to the South American side.Langenus officiated all his matches "whatever the heat, in cap and plus-fours".The Americans played 80 minutes of the game "with one player missing (broken leg after 10 minutes)" - "substitutes weren't allowed, so the United States played on with only 10 men".