Jiralhanae during the First Battle of Harvest, February 2525. (Halo Mythos)
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In 2492, soon after the end of a devastating civil war between Jiralhanae that caused a total collapse in Jiralhanae society, the Covenant visited the Brute homeworld of Doisac and invited them to join. Though some put up a resistance, most were more than willing to join the technologically superior and theologically devout Covenant after surviving through the loss of most of their own civilization.
Related Media
These events are referenced in the novels Halo: Contact Harvest, Halo: Broken Circle and the reference book Halo: Encyclopedia.