After knocking Ireland out at 172 in the first inning, England actually knocked it out of the match when it declared the score 524-4 with a huge 352-run lead after Ollie Pope and Ben Duckett made big milestones Friday.
Starting the game with a score of 97-3, Harry Tector started Ireland by scoring 51 off 98 balls and then hit a ball to point, becoming the fourth wicket of the Tonga debutant in the innings.
Lorcan Tucker and Curtis Camper also struck out before lunch, leaving Ireland on the hook for a third straight defeat seemed inevitable after two tough defeats to Sri Lanka in April.
However, Andy McBreen and Mark Adair launched an effective counter-attack in a blistering encounter in the seventh wicket, scoring 163 runs off 165 balls, the highest total in Test history for Ireland.
Matthew Potts interrupted this encounter when Adair, scoring 88, lightly touched the ball and it flew to the wicket of Johnny Bairstow.
McBreen kept fighting after Fionn Hand became Tonga’s fifth scalp, scoring 86 with no outs, he led Ireland to victory and forced the hosts to bat again, albeit briefly.
Chasing a paltry target of 11 points, England opener Zach Crawley scored three boundaries in four balls for Adair and his 11th win in 13 Tests.
England will now focus on the Ashes series, which begins at Edgbaston on June 16, following Australia’s match against India in the World Test Championship at the Oval from June 7.
England fielded an unchanged lineup for the first two Tests of the five-match series, with Tong retaining his place after an impressive game against Ireland.