Task: Question Answering
Input (English): Passage: The Redskins started their first preseason against the Tennessee Titans on the road on August 11. The Redskins defense allowed only six points and caused four fumbles, one of which they recovered. Many were surprised to see the Redskins' Quarterback Jason Campbell play the whole 1st half. Campbell wasn't productive, fumbled twice, and didn't score any touchdowns. The Redskins scored two late touchdowns in the last 1:17 to win the game. Marcus Mason scored a 1-yard rushing touchdown, and Byron Westbrook recovered a fumble in the endzone.GameBook. 
Question: How many fumbles were not caused by Jason Campbell? 
Answer type: Number 
Output (English): 2.