This article is not part of the Harry Potter universe. This article covers a subject that is part of the real world, and thus should not be taken as a part of the Harry Potter universe.
"Battlefield" is a fast march that relates to the statues theme. It plays during the first part of the Battle of Hogwarts. Its theme serves as the main theme for the battle, except for "Statues" theme.
It can be heard several times during "The Grey Lady", "Showdown" and "Battlefield".
The piece begins with the Hope theme, then plays brief sections of "Voldemort's Motif". It then moves to the Battle of Hogwarts first theme. the piece ended with the "Hedwig's Theme".