Sam Winnall's second-half goal gave Barnsley a 1-0 victory at Sheffield United to end their run of three games without a win.United went close to scoring after only eight minutes when Craig Alcock's close-range header was scrambled off the line by goalkeeper Ross Turnbull.Barnsley's Joe Dudgeon then sent over a low cross which was met by Winnall, but the striker was unable to get his shot on target, lifting the ball over the bar.A quick attack from the home side saw James Wallace find a way through the centre, but his shot was saved by Turnbull.Towards the end of the half, Winnall had a shot deflected wide and Luke Berry fired in a long-range effort which was comfortably saved by Mark Howard in the home goal.After Devante Cole had a shot turned wide by Howard, Winnall scored the winner with a firm 56th-minute header from James Bailey's corner.United substitute wasted a good chance to equalise, putting a free header off-target after meeting Jose Baxter's free-kick.