- last post: 01.01.0001 12:00 AM PDT
I think the covenant controlled the galaxy until another race of aliens banished them into almost complete extinction. Then, millions of years later (The time of Master Chief) the covenant were finally ready to claim the galaxy for themselves. When they attacked Harvest Colony, the UNSC sent ships to find out why the colony had been lost, when they showed up they vanquished the covenant. But, they paied a terrible price in ships and personel. This showed the covenant that this new race called humans were kinda easy to kill, so now they are vaging galactal conquest to conquer the galaxy in its entirity.