According to Hollywood Reporter:
Michael Fassbender, Dominic West and Bond girl Olga Kurylenko are girding their loins for Neil Marshall’s Britain-set sword-and-sandals thriller “Centurion,” for “Slumdog Millionaire” producer Christian Colson of Celador Films.
The movie, billed as a thriller set during the Roman invasion of Britain in A.D. 117, tells the story of Quintus Dias, sole survivor of a Pictish raid on a Roman frontier fort, who marches north with General Virilus’ legendary Ninth Legion, under orders to wipe the Picts from the face of the Earth and destroy their leader, Gorlacon.
Hmmm … the “invasion” of which they speak must be when Falco was sent to suppress an uprising in “Scotland” of assorted tribes, no? I guess they’ll also be telling us what happened to the lost Ninth Legion …
rogueclassicism 
My theory is that the Ninth Legion inadvertently marched into a space-time wormhole and ended up ‘lost’ on a mysterious Pacific island.