Forest won their first European Cup in a season when Liverpool were league Champions, so both sides were in the following season's European Cup and when then drawn against each other in the First Round - imagine that happening now when the rules are geared to make sure the biggest teams are still there in the Champions League's closing stages.
Forest beat Liverpool 2-0 at the City Ground in the First Leg and then got a 0-0 in the game at Anfield. One of the biggest markers of how good Forest were in the late seventies into 1980 was how they tended to get the better of a great Liverpool side when they played them.