Compton had played for Arsenal since 1936 as an amateur and signed professional terms after the war. By 1950 he was 32, on his last legs in football, and had signed for one more season. The FA Cup run took Arsenal through Sheffield Wednesday, Swansea, Burnley, Leeds and Chelsea. Manchester United's manager Matt Busby had publicly tipped Arsenal as worthy winners.
The 1950 final was played in front of 100,000 at Wembley. Liverpool, captained by Phil Taylor, were favourites. Arsenal's Tom Whittaker chose Compton on the left wing, a position he had held all season. Reg Lewis scored after 17 minutes, drilling a low shot past Cyril Sidlow. He added a second in the 64th minute. Compton spent the match probing and crossing; his brother Leslie marshalled the back line. Arsenal won 2-0.
Denis collected his FA Cup winners' medal in the same season he topped the Middlesex batting averages. He retired from football at the end of the season at his brother's insistence after a pre-match brandy joke that became a Wembley legend ('I'm fine, just nervy — you take the dressing room'). His football career had been interrupted by the war, but he had played 60 league matches for Arsenal and won the league title in 1948.