By Chris Emma–

CHICAGO (CBS) — Sunday marked the gameday debut of John Fox’s regime in Chicago and brought forth reminders of the previous regime.

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Memories of Marc Trestman’s troubled time with the Bears came out as we saw the new-look Adam Gase system at work — specifically how he utilized the run game and Matt Forte.

The Bears fell 31-23 to the Packers but totaled 402 yards of offense, including 189 on the ground. Forte finished the game with 141 yards and a touchdown on 24 carries. His greatest takeaway was the demeanor of the offense when faced with adversity.

“Just the mentality of this offense,” Forte said. “Obviously, the schemes are different, but the mentality out there is don’t even blink. Once we had the turnover, they went down and scored. We got the ball back, and nobody blinked.”

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It was clear in Week 1 that Forte will be a key piece to this Bears offense. Last season, he was often forgotten by Trestman’s staff. At halftime, Forte already had 105 yards under his belt, and he was used in the passing game, too.

The Bears’ defense couldn’t keep Packers quarterback Aaron Rodgers in check, and Green Bay was able to answer. But Chicago continued to fight, even scoring on a Jay Cutler touchdown pass to Martellus Bennett in the final minute.

What Forte observed from the Bears’ demeanor was fight, a description which seemed to include a swipe at Trestman and his 2014 team.

“The mentality of this offense,” said Forte, “which I was proud of, is nobody had that stupid look on their face like before, when something would happen and they’re kind of saying the game is lost already when there’s time left. So, I was glad we didn’t have that. We came out and kept fighting.”

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Follow Chris on Twitter @CEmma670.