[Nehkara]

Originally Posted by Yeah_Baby

What was that logic?

It fits the content of the movie better than the previous title.

From Wikipedia:

The third film was titled There and Back Again in August 2012. In April 2014, Jackson changed the title of the film to The Battle of the Five Armies as he thought it better suited the situation of the film. He stated on his Facebook page, "There and Back Again felt like the right name for the second of a two film telling of the quest to reclaim Erebor, when Bilbo’s arrival there, and departure, were both contained within the second film. But with three movies, it suddenly felt misplaced—after all, Bilbo has already arrived “there” in the Desolation of Smaug." Shaun Gunner, the chairman of The Tolkien Society, supported the decision: "‘The Battle of the Five Armies’ much better captures the focus of the film but also more accurately channels the essence of the story."