As far as I can remember, Tolkien never really distinguishes whether or not the dwarves of moria were slain in the wars with the orcs or by the balrog. I've seen timelines saying that Balin was slain in the wars, but the journal in Moria sure does make conspicuous references to the drums sounds from the deep (the balrog). Maybe someone more knoweledgable in this area can shed some more light on this dilemma. Maybe Tolkien never really wanted us to know?
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Those who the Gods would destroy, They first make mad.
~Those Crazy Greeks
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