Originally posted on Football Nation  |  Last updated 6/20/13

The Broncos and 49ers had great defenses in the 2012 regular season, even if it wasn't readily apparent in the playoffs.Seattle's "Legion of Boom" came into their own as a vile force of nature.Chicago's havoc-wreaking led to a seemingly endless loop of defenders scoring touchdowns.Pittsburgh's aging defense gave up the least amount of yards in the entire league.But which NFL defense, heading into 2013, is the best?Considering what each defense accomplished in 2012, and assessing what their 2013 moves mean to their squads as a whole, this is a subjective look at which defensive unit looks strongest going into a new season.And besides, it makes for some good arguments, doesn't it?

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The 'Can I have a quick sword with you?' quiz

NFL Referee Hotline Bling: Austin Seferian-Jenkins drops a call

Blackhawks get extra depth on defense with Rutta and Forsling

The 'Old faces in new places' quiz

25 questions heading into the 2017-18 NBA season

The 'Sure do hope you have a backup plan in place' quiz

Tale of the Tape: National League Championship Series

Sports & Politics Intersect: White House looms large over sports world for another week

The 'A butcher, a Baker, a touchdown maker' quiz

Tale of the tape: American League Championship Series

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