Ok the GameInfromer leaks said that Elites and Grunts were attacking MC and Cortana in the beginning of the mission.FROM HALO WIKIA:
According to the Halo 4 article in Game Informer magazine, the game starts off with the Master Chief and Cortana in the remains of the UNSC Forward Unto Dawn in 2557, with Cortana stating she’s updated the MJOLNIR suit’s firmware while the Master Chief was unconscious, apparent from the new HUD. Intruders are detected on multiple decks, which are identified through flying through an elevator shaft and making the way to the observation deck 4 floors up as Covenant. Firstly, the Master Chief is attacked by an Energy sword wielding Elite, to which he comments “I thought we had a truce with the Covenant”, then encounters Grunts and Elites as he continues towards the observation deck. Cortana points out that the hostiles “aren’t outfitted like standard military” and could be rogue. Some Elites, for example, have no armor on their arms. The ship is then boarded by more landing craft and eventually the pair crash land on Requiem (a.k.a. the Legendary Planet).
I think that the UNSC still has a truce with the covies.BUT there are the HERETICS
Sesa 'Refumee | Halo Alpha | Fandom (Copy and paste to see picture <)
Cortana points out that the hostiles “aren’t outfitted like standard military” and could be rogue. Some Elites, for example, have no armor on their arms
Look at Sesa Refumee’s arms No armor…
THIS IS JUST AN IDEA.
tl;dr
The Heretics might be why elites are attacking in halo 4 even though there was a truce.
PLEASE DO NOT TROLL IF SOMETHING IS WRONG JUST TELL ME.