Quadrant 4 was a region in the northern hemisphere of Harvest, where UNSC Hornets aerial reconnaissance, on orders from Professor Anders, observed a battalion-sized strength of Covenant. Sergeant John Forge was sent on a reconnaissance patrol to determine the force strength and intent, but the Covenant presence had already moved north, into a Forerunner relic. It is likely that this patrol saved him from being present at the Covenant's destruction of Alpha Base.[1]

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