Hoping to rebound from their loss to the Packers the Eagles flew to Ford Field for an NFC Duel with the Lions. The Lions looked good early In the first quarter, but with 11:15 remaining, Shaun Hill was intercepted by Nate Allen. Just four plays into the following drive, the Eagles took the early lead when QB Michael Vick bombed a 45-yard TD pass to deep threat WR DeSean Jackson.Detroit replied, driving 76 yards in 6 plays with RB Jahvid Best hauling a 14-yard touchdown run, taking 3:00 minutes off the clock. After three combined punts, the Eagles then fell behind in the 2nd quarter when kicker Jason Hanson nailed a 49-yard field goal. This was followed by QB Shaun Hill slinging a screen pass to RB Jahvid Best, who took it 75 yards for a touchdown, widening the lead to 17-7. The possession took only three plays and barely a minute off the clock. Then the Eagles replied with an 11 play, 75 yard drive that ended with RB LeSean McCoy taking in a 14-yard TD run. After a Lions punt, the Eagles marched 89 yards in less than a minute with QB Michael Vick throwing a 9-yard TD pass to WR Jeremy Maclin. The Eagles led 21-17 at halftime. On their second possession of the third quarter, the Eagles scored again, with RB LeSean McCoy hammering home a 4-yard TD run. Things got worse for the Lions, as Shaun Hill was intercepted on their next possession by Ellis Hobbs. They managed to force a punt, but wasted a 12 play, 48 yard drive that took 5:49 off the clock. On 4th-and-1 at the Eagles 29, Jahvid Best was stuffed for no gain and the Lions turned it over on downs. Worse yet, the drive took into the fourth quarter. The Eagles seemingly put the game away on their next drive when LeSean McCoy scampered off to the races on a 46-yard TD run on 3rd-and-16 with just 6:27 left, and the Eagles lead 35-17. However, the Lions roared back with RB Jahvid Best finishing off an 85-yard drive with a 2-yard TD run, making the score 35-24 with 4:15 remaining. After forcing a three-and-out, the Lions stormed 56 yards in just 6 plays, culminating with Hill completing a 19-yard TD pass to WR Calvin Johnson (With a successful 2-point conversion). The Lions recovered the onside kick with 1:50 left, but four straight incompletions ended any chance of a miracle comeback.
Question: How many points did the Eagles lead by during halftime?
Answer: 4