The Pompey players produced a battling display against the U’s after seeing Joe Morrell sent off on 16 minutes for a foul on Cameron Brannagan.
Moment earlier, Michael Jacobs cancelled out Luke McNally’s seventh-minute opener.
And after Ronan Curtis had given the 10-men Blues a 51st-minute lead, Blue hearts were broken when the hosts scored an equaliser eight minutes from time through Brannagan, before Nathan Holland got the winner six minutes into injury time.
And after Ronan Curtis had given the 10-men Blues a 51st-minute lead, Blue hearts were broken when the hosts scored an equaliser eight minutes from time through Brannagan, before Nathan Holland got the winner six minutes into injury time.