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The Battle of Cleveland was an engagement between the UNSC Defense Force and the Covenant Military that took place in Cleveland, Ohio on Earth [1]
Purpose
The purpose of the occupation was to find and retrieve the Key of Osanalan, a Forerunner artifact revealed by Colonel James Ackerson during his interrogation. It was a necessary component for the firing sequence of the Halo array to properly initiate it.
It is a smaller battle during the Second Battle of Earth.