McDavid goes off on the refs after Giordano takes a run at him

After a mostly sleepy first period of hockey, The Battle of Alberta is alive and well, baby!

Edmonton Oilers forward Ryan Nugent-Hopkins and Calgary Flames forward Sean Monahan elected to drop the gloves to ramp things up as the first period was winding down

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And then... THE MAIN EVENT!

Big Zack Kassian and Matthew Tkachuk FINALLY drop the gloves and even things up:

It's worth noting that Flames forward Zac Rinaldo was shouting "I'M NEXT!" at Kassian as Kassian was escorted off the ice by officials. Line 'em up, boys! Let's gooooo!

Now Oilers captain Connor McDavid is incensed with the officials after they missed what he felt was a blatant knee on knee attempt from Flames captain Mark Giordano.

Check it out:

Another look: