How did halo start

Halo started when The Covenant attacked UNSC battle ships. The UNSC had to flee because The covenant was to strong. The UNSC later discovered that The Covenant want to use an old weapon called The Ark which holds seven Halo rings destined to destroy humanity. The UNSC tries to stop The Covenants high holy leaders called The Prophets from doing this. The most worshipped and dangerous prophets were The Prophet of Mercy, The Prophet of Regret, and The Prophet of Truth. They continue to attempt to achieving this conflict as the UNSC struggles to stop them from destroying Earth and the entire human race.