From the official website:
Extreme devastation and mass extinction of living beings has blackened a distant universe, and an epic war continues to rage. On a ruined planet, machines of war battle desperately in a death-match to fulfill an ancient prophecy; the fecundation of a new future.
Applying live action performances, stop motion and scale models to this animated post-apocalyptic world, WeWereMonkeys created this elaborate and epic short film. Apparently it's the middle piece of a trilogy and we eagerly look forward to the first and third installments if they ever get made.
Check out the filmmakers site for more information on the trilogy, filmmaking techniques, behind the scenes photos, and to see some of their other works.