Duel between Guinevere and Morgana

The first and so far only sword duel between Guinevere and Morgana occured towards the end of the Series 4 episodeThe Sword in the Stone: Part two. Following Helios's and Isolde's mortal wounding, and the victory of Arthur, Tristan and the knights of Camelot over the Southrons, Guinevere confronted Morgana in her Morgana's chambers. Morgana had earlier been stripped of her magic with Merlin's enchanted poppet, and had been wounded in the hip or chest by a knight of Camelot, so could only fight one-handed. Guinevere chose to find one-handed until her final strike, which Morgana used to throw the sword out of her hand and corner her. Just as Morgana was about to strike Guinevere in the throat to finish her off, Merlin used a stunning spell on Morgana through the doorway, but was not seen by Guinevere, and likely Morgana. As Morgana hit the ground a few metres back, she vanished into thin air.

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How this happened is unknown, whether it was her own magic, Merlin's, or another force.

Script
An exchange of words took place during the duel, including.

GWEN

What did I do to make you hate me so much?

MORGANA

It's not what you did, it's what you're destined to do! I'm sorry, Gwen, but I can never let that happen!

--After Morgana's defeat--

MERLIN

Are you alright?

GWEN

Yes.

What happened?

MERLIN

I don't know.

See full episode transcript