Set a demanding 222 to chase, the Moore and Smalley Palace Shield outfit dug deep and won in dramatic fashion.
Neil Holden hit 35 off nine balls in the last two overs to clinch the victory, that late burst forming part of a superb unbeaten 105.
Northern League side Chorley, who had been asked to bat first, were 221-7 in their 45 overs.
They then seemed to contain Longridge well, the hosts getting to the last four overs still needing 43.
Then came that final flourish with Holden right on song to see his side home and hosed.
In another Palace Shield versus Northern League clash in the National Knockout, honours went the other way with Leyland beating Garstang at the Riverside.
Leyland were 65-run winners, scoring 200-8 after batting first.
They then bowled Garstang out for 135 in 40 overs.
In the Northern League the previous day, Leyland had beaten Morecambe by 43 runs at Fox Lane.
Electing to bat first, Leyland were 165-9, stand-in skipper Chris Parkinson their top scorer with 36.
Andrew Makinson weighed in with a knock of 31, both losing their wickets to visiting sub pro Daryn Smit who posted 3-37 from 17 overs.
Smit hit 39 in Morecambe’s reply, Gareth Pedder adding 35, but the defending champions fell short.
They were 122 all out as the Leyland attack got on top, Henry Thompson taking 4-26, Ross Bretherton 3-9 and Karl Cross 2-23.
Chorley came out on top of their league trip to Lancaster, winning by 49 runs.
Runs were at a premium, with Chorley 114 all out in the first innings.
Wihan Lubbe was their top scorer with 21, Kieran McCullagh hitting 19.
There were three wickets each for Liam Moffat, Ben Simm and Charlie Swarbrick.
Lancaster’s reply was one of struggle, with them dismissed for just 65.
Lubbe, Edwin Moulton and Ian Oakes all claimed three wickets as Chorley triumphed.
Preston and Blackpool met at West Cliff, with the visitors winning by 42 runs.
Asked to bat first, Blackpool were 151 all out, Joshua Boyne scoring an unbeaten 42 batting at eight.
Afzal Kapadia was the pick of the Preston bowlers, taking an impressive 7-46 from a 17-over spell.
It looked a reachable target for Preston but they were bowled out for 109.
Irshad Desai scored 21 and Mustafa Durrani 18. However it was the visitors bowling attack on top – Daryl Mitchell took 4-31. St Annes were beaten by 88 in their clash with Kendal at Vernon Road.
Lesiba Chris Ngoepe scored 89 as Kendal put a commanding 228-9 on the board in the first innings.
Mitchel Bolus took 6-58 for St Annes from a 13-over spell.
In reply, the hosts were bowled out for 140, Nathan Armstrong scoring 36.
Barrow beat Darwen by eight wickets, Kaustubh Pawar hiiting 11 boundaries on his way to an unbeaten 80 for the Cumbrians.
Penrith were 118-run winners at Netherfield, scoring an impressive 207-7.
Fulwood and Broughton and Vernon Carus share the leadership of the Moore and Smalley Palace Shield after both sides recorded big wins.
They went above Garstang, who had started the weekend on top of the table but were beaten by Croston.
F&B beat Torrisholme by 161 runs at Highfield, that their fifth league victory of the campaign.
Electing to bat first after winning the toss, the hosts put 235-8 on the board.
Charlie Rossiter hit 61 and Ben Parkinson 60, Mark Smith adding 34.
James Cookson was the pick of the Torrisholme attack, taking 5-42 in 10 overs.
The visitors were bowled out for 74 in reply, F&B doing the job inside 22 overs.
Chris Brookes and Usman Sadaqat took three wickets apiece, with Jon Fenton and Arbab Munir taking two each.
At Factory Lane, Vernons were 162-run winners against struggling Fylde.
The visitors decision to field made for a long afternoon, with Vernons 278-4.
Their top order piled on the runs, openers Ian Dunn and David Fisher hitting 68 and 56 respectively.
Wes Royle, batting at three, was unbeaten on 58, Christian Ash hitting 60 off 42 balls, including five sixes.
In reply, Fylde were 116 all out, Edward Bailey their top scorer with 32.
Paul Hayton posted 4-10, Ben Llewellin taking 2-25.
Croston inflicted Garstang’s first defeat of the summer, winning by seven wickets at Westhead Road.
After dismissing the visitors for 125, Croston chased down their target inside 25 overs, closing on 128-3.
Longridge are in fourth place after an 86-run win over Whittingham and Goosnargh at Guild Park.
James Whitehead hit 49, Tom Howarth 42 and Luke Platt 38 as Longridge were 218-5 in the first innings.
W&G’s reply saw them bowled out for 132, Zuber Desai hitting 54.
Rory McDonald reeled in 4-44, Alex Mason collecting 3-19 and Andy Simpson 2-24.
Freckleton beat defending champions Great Eccleston in their visit to Hall Lane.
Great Ecc batted first after winning the toss and opener Adam Green scored 48.
But not until Phil Harvey batting at eight, did a home batsman join Green in double figures, Harvey hitting an unbeaten 29.
They were 124 all out, Freck chasing down that target by scoring 126-6, Ashley Moreau 41 not out.
Thornton Cleveleys won by six wickets at Penwortham.
Jack Aspden hit 52 and Paul Green 46 as Penwortham were 191 all out. In reply, Thornton were 192-4, Joe McMillan scoring 70.