The Packers opened their season against their famed arch-rival, the Bears. The Bears, behind the strong running of Matt Forte, had the early lead against the Packers, but the Packers were able to gain the advantage in the second half behind Aaron Rodgers' three touchdown passes, two of which were to James Jones, who had been cut by the New York Giants just a week prior. The Packers clinched the win with a Clay Matthews interception, followed by an Eddie Lacy touchdown run, giving the Packers their tenth win over the Bears in the rivals' 12 most recent games.

Answer this question based on the article: Which team had the lead at halftime?
The Bears