Set between the events of "Halo 3" and "Halo 4," "Halo: Spartan Assault" is a new chapter of the award-winning "Halo" universe that explores the first missions of the Spartan Ops program and dives deeper into the backstory of Human-Covenant wars. Play through the eyes of either Commander Sarah Palmer or Spartan Davis stationed aboard the UNSC Infinity as they fight never-before-seen battles against Covenant forces.