The first ever meeting between Kempston and Harlow, the visitors claimed the three points with three goals in each half.
Kempston Rovers were outplayed by a supremely strong Harlow Town side.
The visitors exerted early pressure but had to wait until the half hour mark to take the lead through Robbie Rees. Dadson added a second before a penalty from Alcock made it three nil at the break.
The second half followed the pattern of the first with Kempston holding out for half an hour before conceding despite a string of impressive saves by Rovers' Knox, Rees with his second of the game to make it four. Samson and Maagbe completed the scoring for the visitors in the last few minutes.
Rovers slip to 15th, whereas Harlow stay in 6th. The reverse fixture is in February back in Essex. Our next fixture is away to table-toppers Berkhamsted on Saturday.