The Bills sent a conditional fourth-rounder for 2015 or a third-round pick in 2016 or a fourth-rounder in 2016.
The teams also swapped seventh- round draft picks in 2014.
Brown has recorded 878 rushing yards and six touchdowns in 32 games with five starts) with the Eagles over the past two years. The 6-foot0, 220-pound former Kansas State standout oined the Eagles as a seventh-round draft pick in 2012.
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Aaron Wilson covers the Ravens for The Baltimore Sun
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This story originally appeared on Nationalfootballpost.com
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