View the photo gallery from the Blues' first League One loss of the season
Pompey saw their unbeaten record finally come to an end with a 2-0 defeat to Gillingham at a damp Fratton Park.
Both goals arrived in the first half, with the opener coming from a stunning volleyed effort from Tom Eaves.
Alex Lacey then converted Dean Parrett's corner just before the whistle to double the Gills' advantage.
The hosts were much better after the break, but were unable to find a route back into the contest.