The Summer Olympic Games were held at the Palace of Engineering, Wembley, in London, England in July 1948.
[5][9] He represented his country, on behalf of the Irish Fencing Federation (IFF), alongside three other men, Harry Thuillier, Owen Tuohy, and Tom Smith, and Dorothy Dermody.
The games were held at the Westend Tennis Hall in Espoo city, Finland.
[12][13] Duffy attended the games alongside three other Irish fencers, George Carpenter, Harry Thuillier and Tom Kearney.
[10][16] However, he was unsuccessful in both events, and failed to rank in the top four finishers which would have resulted in his advancement to the quarter finals.