Joe Flacco says the Browns learned some tough lessons against the Eagles No. 1 defense, and knows what they must do

PHILADELPHIA — Joe Flacco, who’s close to being named the Browns ’ starting quarterback for Week 1 against the Bengals, acknowledged that the offense found out a lot about itself during the good, old-fashioned slugfest against the reigning No. 1 defense in the NFL.

The Browns pitted their overhauled scheme against the Super Bowl champion Eagles on Wednesday, and discovered they need to ramp up their mental toughness. In some cases, their physical toughness too.