Stockbridge were without a number of players for this Hampshire Intermediate Cup tie but still romped to victory over the Portsmouth League side.
The home side took the lead when a shot by Jake Curtis was beaten out only for Jack Hutchings to follow up.
Jake Smith and Beavis both went close before a cross from the left by Nathan Rae was put in by Dean Smith.
Stockbridge went 3-0 ahead when a Beavis free-kick was deflected in for an own goal.
Four minutes into the second half and a 25-yard effort by Hutchings flew in.
The Robins made it 5-0 when a great run by Dave Cotter on the left saw him cross to Smith who smashed home.
With ten minutes to go, Hutchings stabbed the ball home to complete his hat-trick.
Southsea scored a deserved consolation just before the end.
U18 Declan Muspratt came off the bench to make his debut for the first team.
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