A victory was desperately needed at the end of a trying February, during which the Millers had failed to claim a single win.
Joe Rafferty struck after seven minutes to give Matt Hamshaw’s men the lead and Plymouth were unable to produce a response.
It was not a case of the hosts clinging on for dear life either, as the Millers continued to probe in search of a two-goal cushion.
A second goal may have eluded them, but there were jubilant scenes at the full-time whistle when victory was secured.
Here are The Yorkshire Post’s ratings from the New York Stadium.
13. Zak Jules - 7
Slotted into the defence seamlessly after being introduced in the first half. Strong at the back and a nuisance in the opposition box. | Jonathan Gawthorpe
15. Shaun McWilliams - 7
Played in a more advanced role after stepping off the bench and was effective at finding pockets of space. | Jonathan Gawthorpe
16. Lenny Agbaire - N/A
Introduced to shore up the Rotherham United defence late on. | Jonathan Gawthorpe