Mo hit their stride at the Falkirk Stadium on Saturday, swatting aside the Bairns in a convincing 3-0 win.
The three points ensured Petrie’s side had done enough to play for a chance at promotion to next year’s Championship and maintained their excellent record of finishing inside the top four.
"I can’t be more proud, that’s six top four finshes in six years for the club which is great,” said the Montrose manager.
"Regardless of what happens now, we’ll just enjoy the journey and what will be will be in the play-offs.
"I’m over the moon with them.”
Assistant boss Ross Campbell scored his side’s third goal on a landmark day for himself and the club.
"It was great for Ross to come on and that was his 150th appearance for the club,” added the Links Park boss.
"He scored and had his young lad with him so we’re over the moon for him.
"The subs came on and contributed brilliantly and that’s what Montrose are about, it’s not any individual.
"It's our squad that has got us through and we’ll now be able to rest one or two.
"But we still want to go in on a bit of form.”
Attention now turns to a tough home tie against title chasing Airdrie.
"We’ll work really hard again this week for the game,” added Petrie.
"They’re going brilliantly, what Ian Murray has done there and Paul Hartley at Cove is brilliant.”