OAKLAND -- The Raiders lost starting strong safety Tyvon Branch to a leg injury in the first quarter, with the club announcing he would not return to the game.
With Branch out, Brandian Ross went in to play alongside Charles Woodson as a starter in the secondary.
Cornerback Mike Jenkins also left the game with an undisclosed injury and was replaced by rookie D.J. Hayden, with Phillip Adams coming in during nickel situations with Tracy Porter playing the slot corner.
The Raiders led 10-3 at halftime on the strength of an 11-yard run by Marcel Reece and a 46-yard field goal by Sebastian Janikowski.
Reece's touchdown came after the Oakland defense forced a three-and-out on the first series and Phillip Adams returned a punt 30 yards to the 38-yard line.
It was the first opening-drive score by the Raiders since the 2011 regular-season finale.
Josh Scobee's 27-yard field goal accounted for Jacksonville's only points of the half.
Jacksonville looked on the verge of scoring when Maurice Jones-Drew ran around left end and appeared to have a path to the end zone until he was stopped by a free safety Charles Woodson, who leaped over a blocker to make the play along the sideline.
A subsequent Jacksonville delay of game penalty and an incomplete pass forced coach Gus Bradley to call on Scobee for the field goal attempt.
Hern was on the field before the game and posed for pictures with Tyvon Branch, Raiders owner Mark Davis and actor Carl Weathers..