Football and the Three Lines of Defense
Offensive and Defensive NFL Football Positions Explained
49ers' patchwork secondary provides strong last line of defense
2023 NFL Draft Preview: Defensive Line - Drafting for Depth
The Changing Face Of Defense In The NFL: Defensive Line - Dynasty League Football
Commanders end Ravens' record 24-game preseason win streak - ESPN
Georgia football's defensive line develops into fierce front
America's Last Line Of Defense
Football 101: Defensive line gap techniques - The Phinsider
2023 NFC South Breakdown: Defenses
Matt Nelson declined offers to stay on defense due to Lions' long-term vision on offensive line
Madden NFL 24 ranks Tyrann Mathieu as a top safety in the NFL
NFL's best small players: Drew Brees, Phillip Lindsay, Aaron Donald - Sports Illustrated
49ers' Purdy puts his perfect start on the line in a road game against Browns' top-rated defense - Newsday