Gills clinch all three points at the Weston Homes Stadium.
Gillingham responded to Saturday's defeat to Oxford in impressive fashion by defeating Peterborough 1-0 at the Weston Homes Stadium on Tuesday evening.
Connor Ogilvie’s early strike helped move the Gills to within four points of the play-off spots after a determined and hard working display against Darren Ferguson's men.
Gillingham started the game as the better side and went close to opening the scoring in the eighth minute through Jordan Graham’s free-kick, following some superb trickery from Olly Lee to win the foul just over twenty yards out. However, the strike went narrowly over the bar.
Steve Evans' men made the most of their early pressure just seven minutes later when Connor Ogilvie slotted home with his weaker foot from just outside the penalty area, for his fifth goal of the season, following Ryan Jackson’s long throw.
The delivery from the right-back came out to Jordan Graham and, following some fine work from John Akinde, Ogilvie found space outside the box and drilled home an excellent right footed effort which nestled into the bottom corner.
Peterborough responded well and slowly began to grow into the game towards the end of the half, but were limited to any chances of real quality as the Gillingham defence stood firm.
Half-time: Peterborough 0-1 Gillingham
United started the second half on the front foot and came close to their equalizer in the 52nd minute when Sammie Szmodics rattled the crossbar with a volley from twenty yards out. The forward's effort struck the underside of the woodwork before a follow up ball into the six yard box was gathered by the Gills keeper.
The hosts went close again just five minutes later when Jack Taylor headed narrowly wide of Jack Bonham’s goal from close range.
Olly Lee relieved some pressure on the Gillingham defence when he tested the Peterborough goalkeeper from distance, forcing Bursik into a routine stop.
Peterborough were, on the whole, limited to half chances and had several shots blocked by Jack Tucker, Connor Ogilvie and Robbie Cundy, who restricted second place Peterborough to only two efforts on goal following the interval.
Gills maintained their defensive shape well and put bodies on the line to preserve their clean sheet, but had to see out seven minutes of stoppage time.
Sub Ethan Hamilton went agonisingly close to making it 1-1 in the 95th minute, but his powerful effort from just outside the box went inches past Bonham's right post as Posh applied consistent pressure in the latter stages of the game.
However there was still a chance for Dominic Samuel, who came on for Lee, to make it 2-0 in the final seconds when he found himself with time and space in the opposition box, albeit at a tight angle, but Bursik made a fine stop.
The final whistle sounded soon after and the result means Gillingham now sit in ninth place, four points shy of the play-off places with only three fixtures remaining. Posh remain in the automatic promotion positions.
Full-time: Peterborough 0-1 Gillingham
Peterborough United: Bursik, Butler, Thompson, Beevers (77’ Burrows), Kent, Taylor, Clarke-Harris, Dembele, Brown (69’ Hamilton), Szmodics, Ward.
Unused subs: Gyollai, Eisa, Reed, Jones, Mason
Gillingham: Bonham, Jackson, Tucker, Cundy, Ogilvie, Graham (96’ McKenzie), Dempsey, O’Keefe, MacDonald (95’ O’Connor), Lee (80’ Samuel), Akinde
Unused subs: Bastien, Johnson, Woods, Sithole
Referee: Mr S Allison