Was the 77 FA Cup game in the 3rd Round ?
Went to a cup tie at the old Elland Road (am sure the capacity was c.45 thousand ?) where the Leeds fans ran onto the pitch to try and get the match abandoned. The ref took the players off and police horses came on the pitch to get the Leeds fans back on the terraces.
It was chaos outside at full time, as the City fans (as was the custom then) were kept inside the ground.
I was hitch-hiking to Stoke after the game and nearly got battered on the approach road to the M62 westwards.
A great win for City though and a superb atmosphere...