The Battle of Eos is an extended campaign between the Earth Defence Force and the Red Faction over control of the Eos Sector, the 'crown jewel' of the EDF as the plaque by the Eos Memorial Bridge proclaims. The Battle for Eos lasts between the Red Faction's entry into the sector, pushing through the Free Fire Zone in Parker, to the destruction of the EDF Central Command in northern part of Eos.