Coming off their bye week, the Packers flew to LP Field for a Week 9 interconference duel with the unbeaten Tennessee Titans.  In the first quarter, Green Bay trailed early as Titans kicker Rob Bironas got a 31-yard field goal.  In the second quarter, the Pack continued to trail as Bironas made a 25-yard field goal.  The Packers responded with kicker Mason Crosby getting a 23-yard field goal, along with QB Aaron Rodgers completing a 5-yard TD pass to WR Donald Driver.  Tennessee ended the half with RB Chris Johnson getting a 3-yard TD run. In the third quarter, the Titans increased their with Bironas getting a 22-yard field goal.  Green Bay would respond with Crosby getting a 25-yard field goal.  In the fourth quarter, the Pack tied the game with Crosby making a 38-yard field goal.  However, in overtime, Tennessee emerged the victor as Bironas nailed the game-winning 41-yard field goal.

Based on the above article, answer a question. How many touchdowns were scored in the first half?
2