United suffered their first league defeat of the season at Woodside Park, comprehensively beaten by a well-drilled Ormiston side.
The home side were always on the back foot after they had defender Tommy Hazlett sent off after 37 minutes and the East Lothian outfit took advantage with striker Dean Woods completing a hat-trick.
Kelso made a bright start to the match and had a great chance to go ahead after six minutes with good interplay between Frankie Rankin and Liam O’Rourke, with the latter’s shot saved by the feet of Ormiston keeper Andrew McQueen.
The visitors took the lead four minutes later as winger Brian McEwan took off down the left, beat two defenders and swung a cross into the box where Woods was in space to fire home.
A solo run by Woods then set up a shot for striking partner David Ross, which flashed past the upright. United came back and a long-range effort from Ryan Beveridge went over the bar.
United were caught on the counter attack after 37 minutes as a long crossfield ball found McEwan at the edge of the box and as he was driving for goal, United defender Hazlett mistimed his tackle and upended the East Lothian man. Referee Chris Newman adjudged Hazlett to be the last man and promptly showed the Kelso player the red card. Woods stepped up and put the resultant penalty past United keeper Elliott Turnbull.
United created an opening five minutes later when Dean Clark struck a long crossfield ball which was struck on the volley by Rankin. However, the young striker’s shot went just wide of the post.
Ormiston made it three with two minutes of the first half remaining and it was a route-one long ball from the back which Ross ran onto, past the United defence, and shot home past Turnbull.
Ormiston had Turnbull at full stretch just after the break and the United keeper did well to turn a Lee Cochrane shot round the post.
The visitors continued to press and were rewarded with a fourth goal in the 67th minute. A good through ball from midfielder John Morgan was picked up by Woods and he calmly rounded Turnbull before slotting home for his hat-trick.
Woods could have taken his tally to four shortly after, but shot wide when in space inside the box.
Turnbull was again in action to tip over a McEwan curling right-footed effort.
United almost got on the scoresheet two minutes from time, but the Ormiston keeper was in the right place to stop a Dean Clark shot.