Read this article and answer this question The week 12 Monday night matchup with the Saints in New Orleans was perhaps the lowest point of the Giants' season. New York fell behind 21-3 at halftime and New Orleans cruised to a huge victory. Eli Manning threw for 406 yards and two touchdowns, both to Victor Cruz, but by that time the game had long been decided. Drew Brees recorded 363 yards and 4 touchdowns, two of which were recorded by Jimmy Graham, and rookie halfback Mark Ingram picked up 80 yards on the ground and scored the game's final touchdown on a 35-yard run. The 49 points were the Giants' most given up to that point in the season.
How many points was New Orleans leading by at halftime?
18