Sheffield United's Under 23s made it two wins out of two for the development sides on Tuesday shortly after the Under 18s had won at Hull City.
In tough conditions which saw both sides have to cope with driving wind and gales throughout, captain Reece York popped up with the winner in the first half and some superb determined defending in the second half earned the Blades victory.
It was testament to the young Blades with the likes of Harrison Foulstone stepping from the Under 18s against a strong Barnsley side that included several first team players.
It was United who had the first half chance when Jake Young swept an effort wide before the Blades soon had to dig in, York making a stunning challenge to deny Cameron McGeehan before Jordan Amissah stuck out a leg to deny Barnett in a one on one.
The Blades got their reward for their defending shortly after when York timed his run into the box to perfection to get on the end of Iliman Ndiaye's low pull back.
Ndiaye was superb throughout and a constant threat to the Barnsley defence, going close himself shortly after when his effort was deflected into the goalkeeper's hands.
The Blades rode their luck but were a constant threat on the counter. Malik Wills hit the post for the hosts and just as it looked like the rebound would be tapped home, Foulstone appeared with a superb last ditch challenge to knock the ball behind for a corner.
Ndiaye saw efforts then saved and go wide as he continued to be the spark up top and United continued their determined defending after the half-time break.
As the game moved into the final 20 minutes, Barnsley started to throw everything but Ashton Hall and Jean Belehouan in particular threw their bodies in front of every shot the hosts tried on goal.
Hall made a huge block with ten minutes to go after Amissah had pushed away a curling effort, before the goalkeeper made a stunning fingertip to save to just push a free-kick from the edge of the box around the post.
As conditions worsened, the Blades dug deep in the final minutes to walk away with a much deserved three points for the effort they put in.
Blades: Amissah, Sheppeard, Foulstone, Hall, Trialist (Trialist 62), Belehouan, Broadbent, York, Young, Ndiaye, Andall-Gibbons.
Unused subs: Chapman, Viggars, Ayari, Mallon.