- Seen in: “One Small Step”
- Previous: Fourth Battle of Venus
- War: Neosapien War
- Year: 2121
- Location: The Moon
- Tactical victory: Exofleet, Pirate Clans
- Strategic victory: Exofleet, Pirate Clans
- Pirate Clans
- Neosapien Commonwealth
- Commanding officer
- Exofleet: Exocruiser, E-frames, jumptroops
- Pirate Clans:
- Neosapien Commonwealth: all E-frames, Moon base
Winfield had decided to use the entire Exofleet to capture the Moon. Many in Exofleet believe the war was nearly over as the Neosapien navy had been broken in the previous battles. Upon entering orbit Winfield sent in the E-frame squads and jumptroops.
The Neosapien defensive Laser Cannons opened fired and destroyed several targets before Marsh destroyed the turrets. Typhonus gave orders that the Neosapien contingent was to fight to the death. When he told Phaeton of the invasion, Phaeton replied that he needed to resist the attack until reinforcements arrived.
After destroying many of the surface defenses, Exofleet was ambushed by Neosapien E-frames that had been hidden underneath the surface. At the same time, thousands of Neosapien E-frames were sent towards Exofleet. However, the ships that had escaped after the Fourth Battle of Venus were not seen. Winfield launched all remaining E-frames to defend the fleet. Almost instantly, both sides suffered hundreds of casualties from the close range combat. Winfield stated that Phaeton had sent nearly his entire remaining combat force to destroy the invasion force. All E-frame squads were recalled to destroy the Neosapien attack.
Inside the Neosapien commander center, Charlie Company encountered heavy resistence from the defenders. Alec DeLeon and Colleen O'Reilly killed Typhonus, but Deleon was fatally wounded. DeLeon used Typhonus's E-frame to send a message to Phaeton that the Neosapiens had decided to surrender en-masse and "Typhonus" had received a fatal injury in combat. Phaeton then activated the self-destruct systems and destroyed the entire Neosapien E-frame attack force. DeLeon then copied Typhonus's voice and told the command center that Phaeton had surrendered to Exofleet. However, DeLeon died from his injuries. Exofleet was then able to take control of the Moon.