The 1908 men 's 400 metres saw the only walkover in Olympic history , as the American finalists refused to compete in a re-run due to British rules .
The next most successful nation is Great Britain with three gold among its 13 medals .
The 1908 men 's 400 metres saw the only walkover in Olympic history , as the American finalists refused to compete in a re-run due to Great Britain rules .
The next most successful nation is Great Britain with three gold among its 13 medals .