Characters
Fight. Fight to the last man. Fight for your lives.
— Gandalf ‧ The Lord of the Rings: The Return of the King

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker calls for total resistance: keep fighting until the last person falls, and fight as if survival depends on it. The repeated command has the urgency of a desperate rallying cry, demanding all-out courage when defeat seems close.
Context reviewed