Shane Lowry was sent off as Millwall were easily beaten 5-1 by a resurgent Peterborough United on Tuesday night.
The Australian defender was shown a straight red card by referee Darren Bond when he pulled down Posh striker Dwight Gayle who was through on goal with just over 20 minutes remaining.
Lowry had a hand in Millwall's 13th minute equaliser, however, when he played in James Henry who beat Peterborough keeper Robert Olejnik to make it 1-1 after Lee Tomlin's opener.
But after that it was all one-way traffic as Darren Ferguson's side made a meal of the Lions at The Den with Tommy Rowe, Tomlin (second goal), Nathaniel Mendez-Laing and George Boyd all on the scoresheet.
The win allowed Peterborough to move off the bottom of the table into 23rd positon whilst Millwall's slump continues as they fall to 14th with a fifth straight league loss.
