Answer based on context:

Brock Osweiler started his first regular season game for the Texans at home against the Chicago Bears. Houston received the ball first and made it all the way to the Chicago 34 before an Osweiler pass was intercepted by Tracy Porter. The Bears capitalized on the turnover with a 1-yard run from Jeremy Langford. In the 2nd quarter, Jay Cutler fumbled the ball on 4th and 1 at the Houston 31. Cutler recovered the fumble but the drive was turned over on downs. Houston scored on the following drive with a 28-yard field goal from Nick Novak. Following a slow offensive start in the first half, Houston trailed Chicago 10-14 at halftime. Momentum shifted in the 2nd half in favor of the Texans, outscoring the Bears 13-0. With the win, Houston improved to 4-0 all time against Chicago.

Which team was winning at halftime?
Chicago