Pompey's incredible 27-game unbeaten league run came to an end in a thumping 4-0 defeat to the Seasiders last weekend, so all eyes were on them against the Brewers.
Colby Bishop scored his 11th goal of the season from the spot and Alex Robertson sealed a 2-0 victory.
Mousinho said: "I asked them for a solid grown-up performance where they had to show a lot of mettle and they did that in pretty much everything they did."
The victory took Portsmouth level on points with leaders Bolton, who drew 0-0 at third-placed Oxford. It was a first home game in charge for U's manager Des Buckingham.
Peterborough fought back to draw 2-2 against Stevenage through a backheel from Joel Randall and Ricky-Jade Jones. Luther Wildin and Ben Thompson had given Stevenage a 2-0 halftime lead.
Arsenal loanee Tyreece John-Jules opened his account for Derby to secure a 1-0 win at Port Vale.
Barnsley beat Wycombe in dramatic fashion with a bizarre stoppage-time goal from Sam Cosgrove, who took advantage of a huge error from Max Stryjek.
The Chairboys&nbsp;keeper attempted to waste time by delaying picking up the ball, but then fell over after minimal contact and spilt the ball, allowing Cosgrove to tap into an empty net.
Northampton won 2-1 at Blackpool thanks to Sam Hoskins' opportunistic late goal after Jordan Rhodes' 11th goal of the season had cancelled out Kieron Bowie's opener for the Cobblers.
Lincoln secured a commanding 3-0 victory at Cambridge thanks to goals from Danny Mandroiu. (pen), Dylan Duffy and Jack Vale. It proved to be Mark Bonner's last game in charge of the U's.
Charlton overcame Cheltenham 2-1 courtesy of Alfie May's brace of penalties against his former team, while Leyton Orient salvaged a 1-1 draw at Bristol Rovers through a late own goal from Tristan Crama.
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Exeter&rsquo;s winless league run extended to nine games after a goalless draw with Shrewsbury.
Wigan beat ten-man Fleetwood 3-0, with Jordan Jones, Sean Clare and Tom Pearce netting, while Reading climbed off the bottom by thrashing Carlisle 5-1.
A Sam Lavelle own goal set the Royals on their way and further goals followed from Harvey Knibbs (two), Lewis Wing and Femi Azeez.
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