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The Spartan-IIs used the river for training exercises, as they knew the terrain well and could navigate it easily. During the Battle of Reach, a Covenant invasion force of more than ten thousand ground troops, supported by a Covenant Cruiser hovering overhead, landed, and set up camp near the Big Horn River. A section of the Big Horn River was evaporated during the Battle of Reach, when Spartans Fred-104, Kelly-087, and Joshua-029 destroyed the invasion force and the Cruiser using a Fury Tactical Nuclear Weapon.