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It is from this video. It is at 2 minute and 42 second. Here is the context:
A few of his sources contained mentions of Arthur, and some others were realistic accounts of battles and places. But many featured mythical hero es fighting ** ** with with the help of magic swords and sorcery.
The phrase is fighting long odds, that is, they were engaged in a battle in which their chances of winning were very small.
Compare:
He might win the election, but it's a long shot.
