The Redskins marched straight down the field to add to their lead on the first drive of the second half. Alfred Morris rushed in for a 10-yard score to put the Redskins ahead, 20-10, and record his 10th touchdown of the season.
Philadelphia responded with a 30-yard field goal by Alex Henery to close the gap to seven points with just over eight minutes left in the quarter.
Robert Griffin III gave the Redskins their largest lead of the game just before the end of the quarter when he lofted a 22-yard touchdown pass to Santana Moss.
After missing last week with a knee injury sustained in Week 14, Griffin III has completed 12 of 19 passes for 169 yards and two touchdowns.
The game is being televised on FOX.