Colin: -crouches behind a wall and pulls out his sniper- ^come on you stinking wraith come out into my line of fire^
(Ummm the order of the story is halo wars, halo reach, halo ce, halo 2, halo 3 odst, and then halo 3)
Sam: sees Ryan. Loads assault riffle. Then gets an idea. Hops back into Warthog and drives to Ryan's position, running over covenant.
Colin: -runs to the wraith jumps on and kills the driver then gets in and starts heading for Ryan's position- *this is spartan 119 I am on my way and I'm bringing heavy artillery*
Sam: Warthog sustained heavy damages. Activates frag and jumps out. Warthog explodes and kills covenant with it. But not all.
(Actually halo wars works into the story it's twenty years before halo 1 and release isn't the story's actual order)
(Halo wars is about the human first contact with the Covenant on Harvest. The planet was then glassed.)