|Venue: The Den
BEN Pringle halted Millwall's unbeaten run with the winner at The Den.
Alex Revell flicked on Paul Taylor's low cross and Pringle was on hand to convert an easy chance at the far post in the 48th minute.
A lacklustre Lions side rarely looked like getting themselves back in the game and could only create a handful of half-chances after falling behind.
Ian Holloway made two changes to the side that drew at Sheffield Wednesday with veteran forward Ricardo Fuller coming in for striker Lee Gregory and midfielder Josh Wright replacing Jimmy Abdou, who found himself on the bench.
The Lions dictated the play in a cagey first period.
Their best opportunity fell to Fuller, who nodded wide under pressure after the enterprising left winger Lee Martin clipped a delicate delivery to the far post.
In the 20th minute Scott McDonald pulled a tame effort wide following a neat training ground free-kick routine.
The visitor's best moment came at the end of the first 45 minutes when winger Taylor manoeuvred space on the right edge of the penalty area and struck a low drive towards goal.
Millwall goalkeeper David Forde parried into the path of Alex Revell but, with the goal gaping, the striker somehow contrived to slide his effort off target.
Encouraged, Rotherham poured forward again and this time central midfielder Lee Frecklington drove a ferocious shot wide of Forde's right-hand post.
The Millers started the second half on the offensive and Taylor grazed the side-netting with a low drive after cutting in from the left flank.
Taylor was key to the visitors taking the lead. In the 48th minute, he teased right back Carlos Edwards with trickery before sending in a low cross.
Revell's presence caused pandemonium amongst the Millwall defenders and right winger Pringle arrived at the far post to prod the Millers into the lead.
Urged on by an animated Holloway, Millwall rallied and a sustained period of pressure saw them force a series of corners.
The Den faithful called for every decision in the penalty area but the referee gave little their way.
Holloway then threw on attackers Jermaine Easter and Magaye Gueye to inject some much-needed impetus but the Lions continue to toil in the final third.
Williams' fierce volley following was blocked before, from the resulting corner, Martyn Woolford frantically blazed over.
At the other end, goal-scorer Pringle stung the palms of Forde with an angled shot from 18 yards as the game became more stretched.
Time was not on Millwall's side and Rotherham resorted to time-wasting tactics to stem the flow of Lions attacks.
The hard-working Fuller fluffed his lines on the hour mark, rising high to meet a Scott Malone cross from the left only to head over when the net was waiting to bulge.
In a carbon-copy attack Scott McDonald's sharp ball was flicked towards goal by Fuller but trickled harmlessly out of play.
The action ended with frustrated home fans heading for the exits, leaving Holloway and Millwall to rue their missed chances.