BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
Spearheading a bold, covert mission intended to bring an end to the fighting on a war-torn world, a platoon of Clone troopers find their plans undone by faulty intelligence and bad luck, and themselves stranded deep inside hostile territory. With no choice but to see their flawed mission through to its end, the ragged soldiers make their final push toward their target, unaware that their victory could spell disaster for the Republic!
Dirty Dozen in space!