In week 5, the Lions hosted the Philadelphia Eagles to start a three-game home stand. The Lions took a 14-0 lead in the first quarter with a pair of touchdown catches by Theo Riddick, from one and 17 yards out respectively. The Eagles responded in the second quarter with a one-yard touchdown pass from Carson Wentz to Ryan Mathews, cutting the Lions lead to seven points. The Lions added to their lead with a one-yard touchdown pass from Stafford to Marvin Jones. The Eagles responded with a 50-yard field goal from Caleb Sturgis, which made the score 21-10 in favor of the Lions at halftime. The Eagles scored 10 points in the third quarter via a one-yard touchdown pass from Wentz to Josh Huff, and a 33-yard field goal from Sturgis, cutting the Lions lead to one point. The Eagles took their first lead of the game, going up 23-21 in the fourth quarter on a 49-yard field goal from Sturgis. At the 2:34 mark of the final quarter, Darius Slay forced a Ryan Mathews fumble, which the Lions recovered inside Eagles territory. This was Philadelphia's first turnover of the 2016 season. The Lions got into range for a 29-yard Matt Prater field goal, making the score 24-23 with 1:28 left. Darius Slay intercepted a Wentz pass on the Eagles' next play from scrimmage, sealing the Lions victory and giving the Eagles their first loss of the season.. How many points were the Lions ahead by at halftime?