In the 1924 Olympic fencing competition there was controversy over the judging (surprise!). The Italians and Hungarians got so mad at each other that words were exchanged - the point being these guys were all swordsmen - so they had a real duel. Three Musketeers stuff. One of the parties had his son deputise for him (which was allowed under the Code of Honour). One of the participants finished with 12 stitches in his head.
There was also another duel in 1924 which saw one of the referees fighting one of the top fencers. Those 2 guys fought for an hour, but didn't do any serious injury.
The Hungarians and italians REALLY hate each other in fencing (and everyone hates the French). Still do today.
would love to see a youtube of this