Halo Lore: The First Contact Between The UNSC and The Covenant 

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2525: The Kig Yar Shipmistress Char'R Yar has been on a spree of raids against unknown Alien vessels. However in her selfish search for bounty she unknowingly begins the greatest conflict the Covenant and Humanity will ever know.
*slight error. The Kig Yar ship is called Minor Transgression, not Minor Transcendence as we have called it in the video. Sorry for this mistake.