Bury boss Andy Preece's impressive record against Lancashire rivals came to a bitter end at Gigg Lane as Rochdale ran out 2-1 winners in this FA Cup first round clash.
Preece has rarely been on the losing side in derby matches, but can have no complaints at this disappointing FA Cup exit.
The visitors looked up for the game far more from the kick-off and took the lead midway through the first half when New Zealand international Leo Bertos had time and space to fire past Glyn Garner in the Bury goal.
It was no more than Alan Buckley's side deserved and it came as no surprise when they doubled their account four minutes after the interval.
Kevin Townson took advantage of hesitancy in the Bury defence to lob the stranded Garner and send the 2000 travelling fans wild.
But for some reason, Dale took their foot of the throttle and, when sub Chris Porter headed home a Harpal Singh corner, it set up a real grandstand finish.
Porter saw another effort cleared off the line, then headed another over the bar as the Shakers turned the screw and went in search of a leveller.
However, big centre-half Gareth Griffiths almost restored the visitors two-goal cushion late in the game, but he was foiled by a magnificent Garner.
Delighted Dale boss Buckley said: "That was a cracking cup tie and I thought we deserved to be in front at half-time. Both Leo and Kevin took their goals well but it was disappointing when we stopped doing the good things that brought us our two-goal lead.
"To be fair, Bury took the chance with both hands and I think the turning point was the superb save by Matthew Gilks that kept us in front." Buckley's Bury counterpart Preece said: "We just didn't start the game well enough, both goals were poor ones to concede and gave them a lift.
"We went for it in the second half and had chances to save the game but it was our first half display that cost us."