The first leg in Copenhagen finished goalless but just six minutes had gone in the Aviva Stadium when Shane Duffy finally broke the deadlock.
Robbie Brady sent a free-kick in from the halfway line and Nicolai Joergensen miscued his clearance, then Duffy got to the ball before Schmeichel and nodded in to give Ireland a crucial lead!
Check out the goal for yourself below:
That moment when you heard everyone in Ireland ROAR! C'mon Ireland #COYBIG #IreDen pic.twitter.com/QjoRdU1eT8
— Paul Dunphy Esquire (@pauldunphy) November 14, 2017