Both sides went into the match having won their first six matches in the new-look league, meaning that more than 400 people headed along to see who would come out on top in this exciting fixture.
And it was to be the rejuvenated West Lothian outfit who were to be the victors, after a try by winger Jamie King and three penalties and a conversion by full-back Dean Edwards saw them home in a pulsating match.
Preston Lodge did pick up a losing bonus point in defeat and they are second, ten points ahead of RHC Cougars in third.
The Cougars have now won four and lost three of their matches after they edged out by Berwick 17-15 at Scremerston at the weekend while in fourth spot Linlithgow saw off Portobello 13-3 and in the East Lothian derby Dunbar beat North Berwick 15-13.
Dalkeith are firmly on top in RBS East Two and they were at their ruthless best to see off Lismore by the confortable scoreline of 57-12 at home.
Forrester were also in try scoring form to defeat Earlston 41-13, but Edinburgh Northern were beaten 37-20 at Broughton High School by Hawick Harlequins.
The wet weather meant that only two matches in the RBS East Three programme survived with leaders Inverleith seeing their match called off.
Broughton won 23-10 against RDVC to leave them in fourth place while Liberton and Walkerburn played out a cracker, the Borderers winning 33-31.