Alabama and Clemson are underway in the College Football Playoff national championship game.

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These two teams are clashing on the field at University of Phoenix Stadium in Glendale, Ariz., and the fierce battle has led to warfare on Twitter -- especially from NFL players who used to play for each side.

Here is a running feed of some of the best tweets during the game.

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It's safe to say Packers safety and Alabama alum HaHa Clinton-Dix is ready to go.

CJ Spiller is also fired up:

Panthers safety Roman Harper was excited about Derrick Henry's 50-yard touchdown run to give Alabama a 7-0 lead:

Hunter Runfrow scored two straight touchdowns for Clemson on passes of 31 yards and 11 yards to give the team a 14-7 lead. Alabama missed a 44-yard field goal in between. Following the two scores, Bears tackle Jarvis Jenkins took to Twitter:

Perhaps Alabama took Patriots linebacker Dont'a Hightower's advice, because they kept feeding Henry, and he scored on a one-yard run to tie the game at 14.

Jake Coker hit O.J. Howard with a tremendous pass for a 53-yard touchdown in what was the receiver's first score of the year. It gave Alabama a 21-14 lead in the third quarter.

As Clemson pulled to within 21-17 on a 37-yard field goal by Greg Huegel, Buccaneers wide receiver Adam Humphries entertained fans on Twitter.

Clemson's Wayne Gallman scored on a one-yard run to give the Tigers a 24-21 lead, which means Chargers tackle Chris Hairston got a call from his mother.

Alabama tied the game up with 10:34 left in the fourth on a 35-yard field goal by Adam Griffith. That's when things got interesting.

The Crimson Tide recovered an on-side kick, which led to Howard scoring his second touchdown of the game on a 51-yard touchdown pass from Coker.

After a Clemson field goal, Alabama's Kenyan Drake scored on a 95-yard punt return to give Alabama a 38-27 lead.

The teams traded scores from there, but Alabama held on to win the game, 45-40 and clinch its fourth national championship since 2009.

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