The Chicago Bears overcame a sluggish first half and forced five turnovers on their way to a 27-20 victory over NFC North rival the Green Bay Packers on Sunday.

Chicago (2-3) trailed 17-7 at half-time, in large part due to an offense that could muster only 122 first-half yards on 26 plays - good for an average of just 4.7 yards per play. The defense was equally porous, allowing Green Bay (4-1) to accumulate 341 yards before half.

However, after both teams exchanged field goals to open the second half, the Bears started to flash the same kind of defense that ranked fifth overall and forced a league-high 44 turnovers last season. In all, Chicago limited the Packers to just 98 total yards and forced three turnovers in the second half.

Midway through the third quarter, Packer quarterback Brett Favre rolled out to his right and fired a wild sidearm throw into the hands of Chicago linebacker Brian Urlacher, resulting in the Packers' third turnover of the contest. It was the first interception for Favre in his last 142 pass attempts.

On the very next play, Brian Griese lofted a throw to tight end Greg Olsen into the left side of the end zone for the rookie's first NFL score, narrowing the deficit to 20-17 with four minutes 42 seconds left in the third.

After Chicago's next drive stalled, the Bears were forced to punt but benefited from another Packer miscue when Green Bay punt returner Charles Woodson fumbled near the sideline at the end of a 25-yard runback. Punter Brad Maynard scooped up the loose ball and made got both of his knees down before falling out of bounds.

Five plays later, Gould converted on his second 36-yard field goal attempt to tie the game at 20-20 early in the final quarter.

The next five drives resulted in four punts and the Bears' lone turnover of the evening before Griese was able to lead Chicago down the field on their final drive.

The 10-year veteran guided an eight-play, 79-yard march that ended with Griese connecting with former Denver Broncos team-mate Desmond Clark on a 34-yard catch-and-run TD, giving the Bears their first lead of the contest at 27-20 with 2mins 11secs remaining.

Griese completed 15-of-25 passes for 214 yards with two touchdowns and one interception for the game.

Favre valiantly tried to counter with his own scoring drive, eventually leading Green Bay to the Chicago 32 with eight seconds left. However, his last-ditch heave into the end zone was intercepted by Chicago's Brandon McGowan to preserve the win for the Bears.

Favre finished 29-of-40 for 322 yards with two touchdowns and two interceptions for the Packers, who saw their eight-game winning streak dating back to last season come to an end.