The Story of Halo Wars takes place 20 years prior to the events of Halo 1. The Covenant and UNSC forces have been battling for 5 long years on the planet of Harvest. Though the UNSC finally achieves victory, the Covenant are not quick to withdraw and their devotion to the fight is what begins the game for you. Sergeant John Forge, one of the playable characters in the game, has been fighting on the planet's surface. He finds that the Covenant have discovered something in the ice and that's the reason the battle has been going on for so long. Your mission is to find out what's going on and it ultimately leads you on an adventure across the galaxy as you try to prevent the Covenant from using their latest discovery to destroy mankind.