Passage: Against the Baltimore Ravens in week twelve, the Bears wore their 1940s alternate uniforms. The Bears last played the Ravens in 2009, which ended with a Baltimore 31-7 victory. With Jay Cutler still out, Josh McCown continued to play as quarterback for the Bears, who had the eighth-best passing offense in the league with 261.7 yards per game, which competed against the Ravens' 18th-ranked pass defense. On the ground, the Ravens had the tenth-best rushing D with 102.6 rushing yards allowed per game, but offensively, had the 30th-ranked rushing offense, averaging just 73.1 yards per game, going against Chicago's defense which allowed 129.4 rushing yards per game. Against Joe Flacco, the Bears had the opportunity to force turnovers, as Flacco had thrown eleven interceptions in the previous nine games. For the Bears on offense, a liability was to protect McCown from Terrell Suggs and Elvis Dumervil, who combined for 17 of 32 sacks by the Ravens. Two parties had the majority favoring the Bears for the game: 10 of 13 ESPN analysts predicted a Bears victory, with Ron Jaworski, Seth Wickersham and Cris Carter being the only three to predict a win for Baltimore. CBS Sports analysts predicted the Ravens would win in a 5-4 vote. The Ravens opened the game with Ray Rice gaining a 47-yard run, his longest of the year up to that point (his previous highest in 2013 was 14 yards), which led to Rice's 1-yard run with 9:58 in the first. The Ravens added to the score with Justin Tucker's 52-yarder, bringing the score to 10-0. With 4:51 left in the first quarter, the game was suspended due to inclement weather, which included a tornado watch, which was eventually elevated to a tornado warning. Fans were ordered to evacuate the stands and enter the covered concourses, while the teams returned to the locker rooms. The evacuation marked the first time Soldier Field had an evacuation since the stadium's opening in 1921. The game resumed play at 3:25&#160;p.m. ET, after a 1-hour, 53 minute-delay. In the second quarter, Robbie Gould kicked a 20-yard field goal, and eventually, rookie defensive end David Bass escaped a chop block by Rice and intercepted Flacco, scoring on a 24-yard return and tying the game. The Ravens eventually scored on Torrey Smith's five yard touchdown catch, and after Flacco had a pass intercepted by Jon Bostic, Gould ended the half kicking a 46-yarder. After a scoreless third period, Matt Fort&#233; caught a 14-yard pass from McCown and scored with 10:33 in the fourth, the Bears finally taking the lead 20-17. Now behind by three, the Ravens engineered an 82-yard drive to Chicago's 2-yard line, but Rice failed to score twice, and a botched snap from Gino Gradkowski slowed down the Ravens, and Flacco's pass towards Smith was overthrown. As a result, the Ravens resorted to a 21-yard field goal with three seconds in regulation to force overtime. In overtime, Flacco's pass for Tandon Doss fell incomplete, and the Ravens punted to the Bears. McCown then completed a 43-yard pass to Martellus Bennett, and Gould kicked the game-winning 38-yard field goal with 8:41 remaining to win the game 23-20, which lasted five hours, 16 minutes. 
Question: How many interceptions did Joe Flacco throw in the first half? 
Answer type: Number 
Output: 2.