Week 4 takeaways in the NFL: Breakthroughs for Bears, Cowboys

The Chicago Bears emerged as a contender, while the Dallas Cowboys and Tennessee Titans had important wins in breakthrough efforts. The Atlanta Falcons lost again on a poor defensive showing, and the New England Patriots reestablished themselves in the AFC East.

All that and more in Week 4's biggest takeaways from NFL Nation.

This team is tough. The Bengals could have let things spiral out of control after Tyler Eifert suffered a gruesome leg injury early in the second half, but they fought through adversity to match the Falcons stride-for-stride and eventually scored the game-winning touchdown in the final 10 seconds. Players around the locker room talked about how it was a complete team…