The Dallas Cowboys and Oakland Raiders had a joint practice on Tuesday, and the action got out of hand toward the end of the session.
The two sides got into a huge fight during one of the drills, and many players rushed in to defend their teammates.
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As you can see toward the end of the video above, a few Raiders fans were involved in the fight, too.
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The Cowboys will host the Baltimore Ravens in their Week 2 preseason game Saturday. The Raiders host the Detroit Lions on Friday.
Thumbnail photo via Twitter/@CBS11babe