For the summaries of the Halo story ALL credit goes to Andrew or otherwise known as Aperson30 on Youtube and Xbox Live.
Halo Wars by Andrew (aperson30)
The year is 2531, Harvest is under attack by the covenant. Captain Cutter of the UNSC Spirit of Fire sends his troops in led by Sgt. John Forge. Professor Ellen Anders is sent to the surface to investigate a Forerunner Relic. The site is overrun by Covenant, Forge clears the area and Anders activates the relic, which points to another human colony: Arcadia.
The UNSC follow the covenant to Arcadia and attempt to evacuate a city, they take out a covenant base and destroy an unfinished Scarab. An Arbiter captures Anders and escapes the planet with the Spirit of Fire close behind. After following them through a slip space jump, they find a planet covered with an unknown substance.
After fighting through hordes of zombie like creatures (The Flood), the UNSC find a tunnel that leads inside the planet. swarms of robots fly out of the tunnel and begin attacking the monsters. Once inside, the crew learn that the inside of the planet is hollow, the sides of the hollow planet are covered with land and water, and what appears to be a star is seen in the center. Anders is with Arbiter and the Prophet of Regret, The Prophet explains that the only way to activate the Forerunner war ships inside the planet is to use Human DNA. She escapes to a teleporter and finds SGT. Forge on the other side.
They plan to bring a bomb and blow up the star in the center of the planet. The Arbiter shows up for one last fight, John Forge is the victor, and Arbiter is dead. Forge has no choice but to manually detonate the bomb, he commands three Spartan II's to cover the elevator. The Spirit of Fire escapes with all the crew, Forge detonates the bomb and the Planet is destroyed. Anders enters Cryo-sleep since it may be years until the Spirit of Fire makes contact with humans again.
The UNSC follow the covenant to Arcadia and attempt to evacuate a city, they take out a covenant base and destroy an unfinished Scarab. An Arbiter captures Anders and escapes the planet with the Spirit of Fire close behind. After following them through a slip space jump, they find a planet covered with an unknown substance.
After fighting through hordes of zombie like creatures (The Flood), the UNSC find a tunnel that leads inside the planet. swarms of robots fly out of the tunnel and begin attacking the monsters. Once inside, the crew learn that the inside of the planet is hollow, the sides of the hollow planet are covered with land and water, and what appears to be a star is seen in the center. Anders is with Arbiter and the Prophet of Regret, The Prophet explains that the only way to activate the Forerunner war ships inside the planet is to use Human DNA. She escapes to a teleporter and finds SGT. Forge on the other side.
They plan to bring a bomb and blow up the star in the center of the planet. The Arbiter shows up for one last fight, John Forge is the victor, and Arbiter is dead. Forge has no choice but to manually detonate the bomb, he commands three Spartan II's to cover the elevator. The Spirit of Fire escapes with all the crew, Forge detonates the bomb and the Planet is destroyed. Anders enters Cryo-sleep since it may be years until the Spirit of Fire makes contact with humans again.