There is a lot of posturing, if I recall, between the dwarves, elves, and humans before the main event.
Plus that was one thing Tolkien tended to gloss over...the content of the battles.
Plus there is still all the stuff going on to the south with Gandalf, that really was only mentioned as an aside in the book. Another major battle that was more or less brushed off by Gandalf when he talks to Bilbo about it.
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