“And now—Piertotum Locomator!” cried Professor McGonagall. And all along the corridor the statues and suits of armor jumped down from their plinths, and from the echoing crashes from the floors above and below, Harry knew that their fellows throughout the castle had done the same. “Hogwarts is threatened!” shouted Professor McGonagall. “Man the boundaries, protect us, do your duty to our school!” Clattering and yelling, the horde of moving statues stampeded past Harry, some of them smaller, others larger than life. There were animals too, and the clanking suits of armor brandished swords and spiked balls on chains.

pg. 510, Harry Potter and the Deathly Hallows