"halo: spartan assault" takes place in the 26th century between the events of "halo 3" and "halo 4". following the events of "halo 3", the human unsc and alien covenant separatists signed a ceasefire to end a decades-long war. gameplay follows through the perspective of the spartan supersoldiers sarah palmer or spartan davis. the campaign is divided into chapters, then further subdivided into individual missions.