Ok, Morgoth destroyed the lamps and chased the Valar to Valinor, which is pretty cool, but after the Valar came back and gave him a proper beating, he either uses stealth or doesn't come out of his hole voluntarily at all.
Glaurung fought in several major battles of Beleriand and did all the dirty work that Morgoth should have done himself.
As a matter of fact, Glaurung also didn't get shot off the sky the
one and only time he goes into action within the story.
++Glaurung