User blog comment:RhysApo/Elves coming to the aid of men for the last time/@comment-71.197.243.239-20140205022330

In the book, no elves even participate in the battle. That was added in the movie. It's a fight that only men and orcs take part in. (Although Gandald, a Maia, and the Ents also contribute if you want to get technical)