To War

To War is an Achievement in Halo: Reach and Halo: The Master Chief Collection.

Halo: Reach
In Halo: Reach the achievement is unlocked by completing the Campaign mission Tip of the Spear on Normal, Heroic or Legendary.

Halo: The Master Chief Collection
In Halo: The Master Chief Collection the achievement is unlocked by completing Tip of the Spear on any difficulty. The Xbox achievement artwork is a Halo: Reach concept art of the mission's Covenant staging invasion force.

Trivia

 * The achievement's name is a direct quote from Miranda Keyes, when responding to a request for a rally point location from a Marine in the opening cinematic of the Halo 3 level Crow's Nest.