Hayden Allen, a stay-at-home defenceman, rifled home the winner early in the extra frame to give the Legion crew its first road win of the season.
Afterward, Allen said the goal was the biggest of his junior career. Before joining the Legionnaires at the start of this season, he had played two years in Jr. 'C.'
Sarnia head coach Dan Rose said, "We competed hard from start to finish. That was our best effort of the year."
Rose singled out the work of Fogarty, saying the rookie forward was on fire. He really roofed one of his goals. That got our bench fired up."
Fogarty also had an assist on Allen's winner.
Chatham outshot Sarnia 37-26 but Rose said many of the home team's shots came on the powerplay.
The Legionnaires opened the scoring before the four minute mark of the opening stanza when Ryan Vendramin scored his fourth of the season with a bullet drive from the slot. But Michael Verboom tied things up before the period came to a close.
In the middle frame the clubs traded goals, with Nathan Mater getting Sarnia's marker on a penalty shot. Mater found the back of the net with00 rising shot that went in high on the stick side.
Goals came fast and furious in the third, with each team getting two. Fogarty got the first, finishing off a two-on-one break to give the visitors a 3-2 edge. After Chatham went ahead 4-3 Fogarty struck again, this time with a drive from between the faceoff circles.
With the two points Sarnia moved into a tie for fourth in the Western Jr. 'B' hockey loop with London.
Brayden Hopkins, Eric Palazzolo and Kyle Brothers had Chatham's other goals.
Sean Parker picked up his third win of the campaign in the Sarnia net.
The Legionnaires, who now have a 4-3 won-loss record, return to action Thursday when they host the Strathroy Rockets. Game time at the Brock Street Barn is set for 7:10 p.m.