And it was former Trinity player Paul Crompton who scored the visitors’ goal, a penalty kick shortly after coming on as a substitute after Trinity goalkeeper Jimmy Styles tripped Grouville’s Jamie Drummond as he ran into a penalty area.
Dave Le Roux fired Trinity ahead in the third minute when latching on to a long ball he passed the ball past advancing goalkeeper Casey Hickling, who was playing his first match in five months following injury.
Both sides had a late chance to win the game but Crompton nodded over when well placed while Trinity were denied by an excellent Hickling save as the ball arrowed towards a bottom corner.
Grouville’s point took them to the summit ahead of Trinity and Jersey Scottish on goal-difference, all having four points.
Jersey Wanderers maintained their three-point lead at the top of Division II after goals from Chris Andrews, Duncan Prince, Liam Sutton and Ollie Thompson took them to a 4-0 win against St Brelade at the Hockey Club.
Poor pitch markings at St Brelade meant the game was transferred, late, to Wanderers’ ground.
Portuguese Club, St Martin/SCF and Jersey Nomads all moved onto six points after victories – Portuguese leading the way with a seven-goal haul without reply against Beeches Old Boys.
Freddie Mendes, Kamil Adamczau and Bruno Sousa all scored a pair and Carlos Ferreira a single.
St Martin/SCF, the only club with a 100 per cent record, won 4-1 at home against Sporting Academics after Mark Harris notched a brace and Paul Stier and Mark Nightingale singles.
Jonny Irwin replied.
Jersey Nomads won by the same score at the FB Fields against St Clement.
Steve Holt (two), Lukas Kanior and Ged O’Donoghue notched for Nomads and Paul Tumelty for the Saints.
John Patterson, Alan Fernandes, Michael Donoghue and James Makin were on target in St Lawrence’s 4-0 home success against St John.
Division I Reserves champions St Peter preserved their 100 per cent record following a 3-0 home victory against Sporting Academics.
Lee Turner, Gary Freeman and Colin Wood were on target.
David Streets hit a hat-trick as St Brelade won by the odd-goal in 11 away to Trinity.
Tony De Abreu (two) and Chris Roche also netted for the visitors with Graham Ling (two), Davie Pita, Leon Huchet and Ivan Reillo registering for the hosts.
Rozel Rovers won 2-1 at Le Couvent against Jersey Wanderers where Martin Godfray and Jermaine Bailey scored for the winners and Neil Spacie for the losers.
St Paul’s, St Martin/SCF and Magpies all won for the second time in Division II Reserves, St Paul’s chalking up the biggest victory 6-1 away to St Clement.
Leon Nightingale hit St Clement’s consolation with St Paul’s converting through David Tonner (three), Ollie Gallagher (two) and Martin Cassidy.
Pascal Corcoran hit a hat-trick and Leon Cole a single as St Martin/SCF won 4-2 at home against St Lawrence, for whom there was an own goal and one by Michael Donoghue.
Both the other games in the division were won by the odd-goal, Magpies 4-3 against Beeches Old Boys at Les Quennevais and Jersey Nomads 3-2 against the home team at St John.
Neil Brédonchel (three) and Gary Drakes scored for the ‘Pies and Mark Mauger (two) and Kurt Miller for Beeches.
Jerry Vieira and Mark Roche notched for St John and Declan Norris, Alex Oliver and former St John player Aaron Masefield for Nomads.
St Peter closed the gap to one point at the top of Division C after defeating early leaders Jersey Wanderers 5-4 at St Peter.
Phil Kendall scored twice and Josh Franco, Jon Rabey and Gary Bateley once each for the hosts with the visitors netting through Tony Salaun, Jon Chapman, Justin Jouan and Scott Young.
Champions Grouville, who have a game in hand, cruised to an 8-0 win at Le Boulivot against Rozel Rovers following strikes by Richard Russell (three), Jason Byrne (two), Darren Quintal (two) and Chris Smith.
Two goals by Carlton McKain and singles from John de la Mare and Darren Mollet earned St Brelade a 4-3 home win against Sporting Academics, who replied through Dave Harrison (two) and Liam O’Connor.
Phil Faulkner grabbed a brace and Nathan Brown, Peter Hewlett and Phil Le Rossignol singles in St Ouen’s 5-1 home success against St Clement.
The visitors’ consolation came through Tyrone Chapman.