"When the Trolls caught the Dwarves in the woods between Bree and Rivendell" is right.
Additionally, Gandalf 'disappeared' and reappeared in the goblin cave to cause a great fire that sent out white sparks among all the goblins. As the Great Goblin stands dumbfounded, Glamdring appears and takes off his head. [img]smilies/wink.gif[/img]
He actually "appeared suddenly, and stood alone, with arms uplifted between the advancing dwarves and the ranks awaiting them." This would be after Bilbo had taken Thranduil/Bard the Arkenstone, when the dwarves attack while Bard and his men are debating. Gandalf stops them just in time to see the goblins/wargs who were following Dain and his men.
I *think* these are the only occurrences.
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...take counsel with thyself, and remember who and what thou art.
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