Huddersfield climbed out of the relegation zone with a battling 2-1 Yorkshire derby victory at home to Barnsley.
Goals from captain Christopher Schindler and leading scorer Karlan Grant did the damage as the Terriers stretched their impressive unbeaten run to six games and condemned Barnsley to their longest winless league run for 48 years.
That meant Cowley's team jumped two places in the standings and left strugglers Barnsley rooted to the basement after a worrying eighth league loss.
They have now not won in their last 13 games, their worst run in the league since 1971.
German defender Schindler's first goal for a year in the first half and Grant's third goal in four games, shortly after the restart, made sure the hosts toasted an afternoon to remember at the John Smith's Stadium.
Cowley made three changes to his side which drew 0-0 at home Middlesbrough on Wednesday night.
The Tykes were unchanged following their impressive 2-2 draw at West Brom on Tuesday night.
It was the visitors who started brightly with defender Dimitri Cavare having a shot blocked in the box after only six minutes.
At the other end, striker Cauley Woodrow powered a right-foot shot well wide of the right upright.
The opening goal came after some excellent work from Grant. The on-song striker cut the ball across the face of goal from the right byline and the unmarked Schindler was waiting to slot home at the back post.
It was the defender's first goal since scoring in a 1-1 draw with Burnley in the Premier League last season.
Cameron McGeehan shot over the bar from point-blank range as Barnsley countered, but his effort wouldn't have counted anyway, with the midfielder adjudged to be offside.
Excellent work from midfielder Lewis O'Brien led to Huddersfield's second, his trickery teed up Grant who, after a lovely turn, curled the ball sweetly into the top-right corner with a stunning finish.
Dougall went close to pulling a goal back with a thunderous free-kick which flew wide of the left upright.
Kachunga had another great chance to score but he dragged his right-foot shot wide from inside the penalty area.
Brown bagged his first Championship goal with a smart finish late on, but Huddersfield claimed precious derby bragging rights.