Bristol City and Barnsley both caused upset results in the Championship on Tuesday, with 2-0 wins over Watford and Millwall respectively.
Despite starting the day in last (Bristol) and second last (Barnsley) on the table, Peterborough were consigned to bottom spot after the two strugglers in action earned a valuable three points in their fight to avoid relegation.
The pair now sit equal on 28 points – still four points deep into the drop zone.
Barnsley were buoyed to victory over Millwall courtesy of second-half goals to Chris Dagnall and Jason Scotland at Oakwell Stadium.
Scotland was a substitute for Marlon Harewood, and took less than 60 seconds to find the back of the net with a strike into the top-left corner of the net, to add to Dagnall’s close-range opener on 56 minutes.
Bristol City also wrapped up a two-goal victory at Ashton Gate Stadium, taking care of fourth-placed Watford.
Despite being some 20 places apart in the table, it was relegation-threatened Bristol that did the damage on the scoreboard, with Gregory Cunningham and Paul Anderson striking for the hosts.
Cunningham struck a 35-yard pearler to open the scoring just prior to the break, before Anderson tucked one away into the bottom left corner 20 minutes after the re-start to seal a vital three points for Bristol.