Coming off of their blowout divisional road win over the Broncos, the Chargers went home for a Week 6 divisional duel with the Oakland Raiders.  In the first quarter, the 'Bolts came out striking with RB LaDainian Tomlinson got a 3-yard and a 27-yard TD run.  In the second quarter, the Raiders managed to get on the board with LB Thomas Howard returning an interception 66 yards for a touchdown, along with the only score of the period.  In the third quarter, San Diego went back to work with Tomlinson getting a 13-yard TD run for the only score of the period.  In the fourth quarter, Oakland tried to salvage a comeback as QB Daunte Culpepper threw a 1-yard TD pass to TE Zach Miller.  Instead, however, the 'Bolts sealed the victory with Tomlinson getting a 41-yard TD run. With the win, the Chargers entered their bye week at 3-3.

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