“For Gondor” is closely associated with The Lord of the Rings and the kingdom of Gondor from J. R. R. Tolkien’s story, especially as adapted in Peter Jackson’s film trilogy in the early 2000s. Online, the line spread as a quick heroic cue for scenes that need instant battlefield energy without a long speech. It still gets used because the reference is easy to recognize, the delivery is short and powerful, and it fits both sincere fantasy edits and ironic overreaction jokes.