This marks the second consecutive year the Eagles have acquired Harrison in a midseason trade. Last year, they traded Mike Bell to the Cleveland Browns for Harrison, who totaled 239 rushing yards and one touchdown in Philadelphia.
"I didn't know if somebody was playing or not, but then once I realized it was serious, I was like 'Cool,' you know, play for a great coach, great organization," Harrison said about Tuesday's trade, according to the Eagles' official website. "I'm excited to be back. The week off will be huge to get back in the playbook and start hearing the terminology again. I have been checking out the Eagles to see how LeSean (McCoy) is doing, and he's doing great. I'm excited to be back."
Harrison had just 14 carries for 41 yards with the Lions this season. But in 2009, he led the Browns with 194 carries for 862 yards and five touchdowns, and he also tied for the team lead with 34 receptions for 220 yards and two touchdowns.
"We're excited to reacquire Jerome Harrison and add another draft pick in 2013," Eagles general manager Howie Roseman said in a statement released by the team. "Jerome had a lot of success in Philadelphia last season, and he adds another back to LeSean McCoy and Dion Lewis contingent. We want to thank Ronnie Brown for his contributions over the past six games and we wish him the best of luck in Detroit."
Brown, who made one Pro Bowl in six seasons with the Miami Dolphins, had just 13 carries for 38 yards with the Eagles, and his fumble Oct. 2 against the San Francisco 49ers likely cost his team a win. But he could be needed in Detroit, with Jahvid Best nursing a concussion.
The Associated Press contributed to this report.