Sheffield United clinched promotion to the Sky Bet Championship after coming from behind to beat Northampton 2-1 at Sixfields.
The Blades left it late, but an 88th-minute winner from John Fleck sparked jubilant scenes from the away end as they celebrated a return to the second flight.
The visitors had started sharply with Samir Carruthers and Jay O'Shea going close, but Cobblers captain Marc Richards should have broken the deadlock when he volleyed over from close range.
It was the Cobblers who broke the deadlock on the stroke of half-time as Richards exchanged passes with Michael Smith before unleashing a thunderbolt into the top corner of the net from a tight angle.
Top-scorer Billy Sharp was thrown on for the restart and the equaliser arrived on the hour mark when Fleck released Leon Clarke, who raced clear before blasting the ball past Adam Smith.
The Blades piled on the pressure before Sharp found Fleck with just two minutes to go, and the midfielder beat Adam Smith from close range to seal a dramatic win.