Ben Roethlisberger threw a 9-yard touchdown pass to Isaac Redman with 2:51 left after Troy Polamalu forced a fumble with a sack of Joe Flacco, and the Pittsburgh Steelers beat the Baltimore Ravens 13-10 on Sunday night to gain sole possession of first place in the AFC North. A fierce defensive battle turned when Polamalu hit Flacco s arm on a safety blitz.