CHICAGO -- This new and supposedly improved offense is producing some awfully familiar results for the Chicago Bears.

Jay Cutler looked shaky again and the defense made up for it, harassing Philip Rivers early on and setting the tone for the Bears in a 33-28 victory over the San Diego Chargers in a preseason game on Thursday night.

All eyes remain on the quarterback after the Bears made some big changes on offense in the offseason, hiring coach Marc Trestman to replace Lovie Smith and revising their line.

So far, the results are mixed at best.

Cutler played a quarter and completed 4-of-5 passes for 38 yards and a touchdown, but the only receiver he targeted was Brandon Marshall. That's not a good sign for the Bears, considering they want to distribute the ball more evenly this year. Nor was Cutler getting intercepted trying to hit Marshall in double coverage.

On a more positive note for the Bears' offense, Matt Forte ran for 74 yards and a touchdown on eight attempts after carrying just once in a loss at Carolina in the preseason opener.

His 58-yard run around the left end set up the game's first touchdown, a 5-yard strike from Cutler to Marshall.

Devin Hester also showed a spark, returning the game's opening kickoff 45 yards. And reserve Michael Ford ran one back 100 yards in the third quarter, leading to a 3-yard scoring run by Michael Bush.

The first-team defense sacked Rivers three times and forced two turnovers, even though star defensive end Julius Peppers (hamstring), defensive tackle Henry Melton (concussion) and linebacker D.J. Williams (strained right calf) sat out with injuries.

Rivers got swarmed as soon as he stepped on the field, and the Chargers fell again after getting pounded by Seattle last week. He was 5 of 9 for 50 yards with an interception, and he lost a fumble on a sack by Shea McClellin, leading to a 3-yard run by Forte that made it 14-0 near the end of the first quarter.

Backup Charlie Whitehurst came in early in the second quarter and was 6 for 9 for 69 yards and a touchdown. He fumbled away his first snap, leading to a field goal by Robbie Gould, but he also led the Chargers on an 80-yard TD drive late in the half.

Cutler got sacked twice on the opening drive, an ominous start after he threw an interception on Chicago's first play from scrimmage the previous week.

Jarret Johnson burst through the left side to force a fumble on second down that the Bears recovered, and Cutler held the ball too long on the next play, resulting in a sack for Corey Liuget.

Forte set up Chicago's first touchdown on the next possession when he turned a pitch into a 58-yard sprint down the left side to the 5. Marshall, who sat out last week after having offseason hip surgery, then caught a strike from Cutler in tight coverage to give the Bears a 7-0 lead.

They had a chance to add to it after Chris Conte picked off Rivers at the 35 on the next possession. But on the first play, Cutler got intercepted by Donald Butler trying to hit Marshall in double coverage.

The Chargers were driving near midfield when McClellin sacked Rivers from the blind side and forced a fumble that Major Wright recovered. The Bears took over on the San Diego 35, and Forte ran it in from the 3, making it 14-0 with 18 seconds left in the quarter.

Both teams were missing some key players, although Peppers' absence was a bit of a surprise.

Trestman said this week that the eight-time Pro Bowl defensive end would play after sitting out against Carolina, but he was not in uniform.

The Chargers held out Danny Woodhead because of his undisclosed injury and receiver Malcolm Floyd after he hurt his right knee in practice on Monday. Rookie linebacker Manti Te'o also sat out as expected after spraining his right foot against Seattle last week.

Liuget left late in the first quarter with a shoulder injury. And Bears third-string quarterback Matt Blanchard injured his left hand in the second half, forcing Josh McCown back into the game.

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  • Philip Rivers, Ryan Mathews

    San Diego Chargers quarterback Philip Rivers (17) hands off the ball to running back Ryan Mathews (24) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Matt Forte

    Chicago Bears running back Matt Forte (22) runs against San Diego Chargers defense during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Michael Bush, Josh McCown

    Chicago Bears running back Michael Bush (29) celebrates his touchdown run with quarterback Josh McCown (12) during the second half of the preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Michael Bush

    Chicago Bears running back Michael Bush (29) runs for a touchdown during the second half of the preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Ladarius Green, Tom Nelson

    San Diego Chargers tight end Ladarius Green (89) rolls into the end zone against Chicago Bears defensive back Tom Nelson (46) for a touchdown during the second half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Shea McClellin, Philip Rivers

    Chicago Bears defensive end Shea McClellin (99) sacks San Diego Chargers quarterback Philip Rivers (17) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. Rivers loses the ball which was recovered by Bears safety Major Wright on the play. (AP Photo/Charles Rex Arbogast)

  • Fozzy Whittaker, Lance Briggs

    San Diego Chargers running back Fozzy Whittaker (34) runs against Chicago Bears outside linebacker Lance Briggs (55) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Mike McCoy

    San Diego Chargers head coach Mike McCoy watches from the sideline during the first half of the preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Philip Rivers

    San Diego Chargers quarterback Philip Rivers (17) reacts on the sideline during the first half of the preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Fozzy Whittaker

    San Diego Chargers running back Fozzy Whittaker (34) points to the sky after scoring a touchdown against the Chicago Bears during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Marc Trestman

    Chicago Bears head coach Marc Trestman talks to his players during the first half of the preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Donald Butler, Brandon Marshall

    San Diego Chargers inside linebacker Donald Butler (56) intercepts a pass intended for Chicago Bears wide receiver Brandon Marshall (15) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Donald Butler

    San Diego Chargers inside linebacker Donald Butler (56) celebrates after intercepting a ball during the first half of the preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Donald Butler

    San Diego Chargers inside linebacker Donald Butler (56) celebrates after intercepting a ball during the first half of the preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Matt Forte

    Chicago Bears running back Matt Forte (22) points to the sky as he celebrate his touchdown with his teammates during the first half of the preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Matt Forte

    Chicago Bears running back Matt Forte (22) rolls into the end zone for a touchdown against San Diego Chargers nose tackle Kwame Geathers (92) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Shea McClellin, Philip Rivers

    Chicago Bears defensive end Shea McClellin (99) sacks San Diego Chargers quarterback Philip Rivers (17) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. Rivers loses the ball which was recovered by Bears safety Major Wright on the play. (AP Photo/Charles Rex Arbogast)

  • Major Wright

    Chicago Bears strong safety Major Wright (21) celebrates after his fumble recovery against the San Diego Chargers during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Corey Wootton

    Chicago Bears defensive end Corey Wootton (98) celebrates after sacking San Diego Chargers quarterback Philip Rivers (17) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Shea McClellin, Philip Rivers

    Chicago Bears defensive end Shea McClellin (99) sacks San Diego Chargers quarterback Philip Rivers (17) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. Rivers loses the ball which was recovered by Bears safety Major Wright on the play. (AP Photo/Charles Rex Arbogast)

  • Kendall Reyes, Matt Forte

    San Diego Chargers defensive end Kendall Reyes (91) tackles Chicago Bears running back Matt Forte (22) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Corey Wootton

    Chicago Bears defensive end Corey Wootton (98) celebrates after sacking San Diego Chargers quarterback Philip Rivers (17) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Corey Wootton, Philip Rivers

    Chicago Bears defensive end Corey Wootton (98) sacks San Diego Chargers quarterback Philip Rivers (17) during the first half of a preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Jay Cutler

    Chicago Bears quarterback Jay Cutler (6) looks for a receiver during the first half of the preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Brandon Marshall

    Chicago Bears wide receiver Brandon Marshall (15) celebrates his touchdown reception against San Diego Chargers with his teammates during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Matt Forte

    Chicago Bears running back Matt Forte (22) runs against San Diego Chargers defense during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Jay Cutler

    Chicago Bears quarterback Jay Cutler (6) reacts after throwing a touchdown pass during the first half of the preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Mike McCoy

    San Diego Chargers head coach Mike McCoy pause for the national anthem before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Matt Forte, Eric Weddle

    Chicago Bears running back Matt Forte (22) runs against San Diego Chargers free safety Eric Weddle (32) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Philip Rivers

    San Diego Chargers quarterback Philip Rivers (17) throws a pass against the Chicago Bears during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Jay Cutler, Corey Liuget

    Chicago Bears quarterback Jay Cutler (6) gets sacked by San Diego Chargers defensive end Corey Liuget (94) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Kiichiro Sato)

  • Jay Cutler , Corey Liuget

    Chicago Bears quarterback Jay Cutler (6) gets sacked by San Diego Chargers defensive end Corey Liuget (94) during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Martellus Bennett

    Chicago Bears tight end Martellus Bennett (83) gets stopped by the San Diego Chargers defense on his kick off return during the first half of the preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Jay Cutler

    Chicago Bears quarterback Jay Cutler (6) looks for a receiver during the first half of the preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Kiichiro Sato)

  • Marc Trestman

    Chicago Bears head coach Marc Trestman watches his team before a preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Manti Te'o

    San Diego Chargers inside linebacker Manti Te'o walks around the field before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Philip Rivers, Brandon Marshall

    San Diego Chargers quarterback Philip Rivers (17) and Chicago Bears wide receiver Brandon Marshall (15) greet each other before a preseason NFL football game, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Jay Cutler

    Chicago Bears quarterback Jay Cutler (6) warms up before a preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Philip Rivers

    San Diego Chargers quarterback Philip Rivers (17) warms up before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Fans go through security check as they arrive at Soldier Field before a preseason NFL football game between the Chicago Bears and the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Marc Trestman

    Chicago Bears head coach Marc Trestman walks around the field before a preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Security guards check bags as fans arrive at Soldier Field before a preseason NFL football game between the Chicago Bears and the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Jim Prisching)

  • Philip Rivers

    San Diego Chargers quarterback Philip Rivers smiles as he warms up before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Jay Cutler

    Chicago Bears quarterback Jay Cutler warms up before a preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Manti Te'o

    San Diego Chargers linebacker Manti Te'o warms up before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Brandon Marshall

    Chicago Bears wide receiver Brandon Marshall warms up before a preseason NFL football game against the San Diego Chargers, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Manti Te'o

    San Diego Chargers inside linebacker Manti Te'o arrives at the Soldier Field before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Manti Te'o

    San Diego Chargers linebacker Manti Te'o warms up before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

  • Philip Rivers

    San Diego Chargers quarterback Philip Rivers, left, jokes around with defensive coordinator John Pagano before a preseason NFL football game against the Chicago Bears, Thursday, Aug. 15, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)