The parish club took the honours as a result of the only club being able to pass their points total, previously fifth-placed Rozel Rovers, also losing – 3-1 at home to Sporting Academics.
Steve Ashton was on the mark for Grouville and Duncan Prince and under-16 player Barry Keith for Wanderers, the latter who bagged a brace.
Danny Chapman, Sean Doran and Craig Beeley netted for the Accies with Lee Kent hitting Rozel’s consolation at Le Couvent.
Trinity are relegated to Division II Reserves after they were defeated 2-1 by Jersey Scottish at Les Quennevais, where James Keating scored from a penalty kick for Trinity.
St Brelade and St Peter shared six goals at St Brelade.
Jason Reynolds and juniors Jordan McBride and David Streets were on target for the hosts and Colin Wood (two) and Scott Welsh, an under-16, for the visitors.
There were victories for Jersey Wanderers and St Clement in Division II, Wanderers 5-1 at the Hockey Club against Beeches Old Boys while St Clement returned 3-0 victors from St Lawrence.
Bradley Cooper (two), Chris Andrews, Karl Sutton and junior Ollie Thompson scored for Wanderers and Bob Bonney, with his 15th of the campaign, for Beeches.
Beau Waugh’s brace took him to 17 for the season for St Clement with Matt Scriven striking the Saints’ other.
Under-18 players scored ten of St Paul’s goals in a 11-2 Division II Reserves victory against Jersey Nomads at Les Quennevais.
The Saints, who are now up to joint-second, were on the mark through Paul McGinness and juniors Ollie Gallagher (five), Declan Sowney (three), Craig Quémard.
Nomads replied through Chris Duhamel and Martyn Jubb.
Joint-second St Clement slipped a place on goal-difference despite winning 3-1 against the Portuguese Club at Les Quennevais.
Jason dos Santos (two) and Matthew Cox were on the mark for St Clement and Carlos Ferreira for Portuguese.
Ashton de Carteret notched a pair and Gary McGorty a single helping Beeches Old Boys to a 3-1 win over the home side at St Lawrence.
Giles Emmanuel replied.
St Martin/SCF and St John shared four goals at St Martin.
Leon Cole and Neil Woolfenden were on target for the hosts and Mark Roche and Pawel Wydro for the visitors.
Four clubs remain in contention for the Division C title where leaders St Brelade have finished their fixtures while the others all have a different number of games to play.
St Brelade completed their programme with a 6-4 win at home to St Ouen, leaving them three points clear of second-placed Jersey Wanderers who won 4-2 at St Clement.
Carlton McKain scored a brace and Nico Bisson, Jason Gow, Nathan Hartley and U16 Seb Poole singles for St Brelade while Shane Carré notched a hat-trick and Peter Hewlett a single for St Ouen.
Scott Young and U18s Scott Slicer (two) and Stuart Brown were on target in Wanderers’ away win.
Grouville, who have three games to play and trail the leaders by five points, won 6-1 at St Martin/SCF.
Chris Burton notched for the hosts while Richard Russell, Nick Walmsley, Danny Hughes, Alex Buesnel, Mark Walmsley and a Saints defender registered for Grouville.
Rozel Rovers and St Brelade featured in a 3-3 draw at Le Couvent where Sean Doran, with his second goal of the afternoon after scoring for the Reserves, Justin Spencer-Burrows and Ged Horgan netted for Accies and Tony Amorin (two) and Andy Godfray for Rozel.