My favorites have already been posted, but I'll repeat them:
Quote:
Out of doubt, out of dark to the day's rising
I came singing in the sun, sword unsheathing.
To hope's end I rode, and to heart's breaking;
Now for wrath, now for ruin and a red nightfall!
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(I use that one a lot).
Quote:
Arise now, arise, Riders of Theoden!
Dire deeds awake, dark is it eastward.
Let horse be bridled, horn be sounded!
Forth Eorlingas!
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Quote:
Arise, arise, Riders of Theoden!
Fell deeds awake; fire and slaughter!
spear shall be shaken, shield be splintered,
a sword-day, a red day, ere the sun rises!
Ride now, ride now! Ride to Gondor!
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Quote:
'Yes! The Elf-warrior is loose!' he cried. 'I'm coming. Just you show me the way up, or I'll skin you!'
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Quote:
Out of doubt, out of dark, to the day's rising
he rode in the sun, sword unsheating.
Hope he rekindled, and in hope ended;
over death, over dread, over doom lifted
out of loss, out of life, unto long glory.
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Not a battle cry, but really good all the same.
Quote:
Ride now! Ride now! Ride to Gondor!
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Quote:
Theoden King! Theoden King!...Mourn not overmuch! Mighty was the fallen,
meet was his ending. When his mound i raised,
women then shall weep. War now calls us!
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Wow! That was a long list! As you can see, every Tolkien battle cry is my favorite. But some good non-Tolkien ones include The Song That Never Ends, evil laughter, "The metallic blue rats are upon you!", "Stand and fight!" (in a duel), and something along the lines of "Kill them!"