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Operation A: Umbra is the first operation of Halo: Spartan Assault.
- Assault on CF-32
- The Mirror Mantle Counter-Assault
- Reinforcement of the Perch
- Live to Fight
- The Last Stand
Cuts to a battle where there are multiple Spartans and ODST's fighting the Covenant as a Pelican flies by and shoots missiles. The battlefield zooms out revealing a grid as Roland gives out introductions.
- Roland: "Greeting, Spartan. I'm Roland, UNSC Infinity's A.I.. We're going to study the historical battles in hopes of increasing your tactical skills for the future. As a bonus, it's a pretty fun game you can play in your spare time. So let's get to it."
The planet Draetheus V then appears.
- Roland: "Loading up records for the Battle of Draetheus V. The fighting started when a splinter sect of Covenant ignored the Ceasefire of 2552 and attacked UNSC forces."
Covenant ships then appear and deploy ground troops.
- Roland: "By the time the fighting was done... Well, it didn't end well for the UNSC or the Covenant, either one. Spartans Davis and Palmer were both stationed on Draetheus-V's moon at the time of the first attack. Let's see how they succeed in the repelling the first assault waves."
Davis drives a warthog and sees Palmer as he sees the ships coming in.