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] The purpose of the raid was the retrieval of 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.