Historic Battle map pack

The Historic Battle DLC is a map pack for Halo Wars. The pack was released on July 21, 2009, for 800 Microsoft Points. It was later made free alongside all other Xbox 360 Halo DLC, and was included in the 2017 release of Halo Wars: Definitive Edition.

Description
Expand your Halo Wars experience with the Historical Battle Map Pack Add-on. These new maps highlight key turning points in the epic war between the UNSC and Covenant forces. The maps include: Blood River – battle a single opponent over a treacherous natural chokepoint; Barrens – engage your enemy in the midst of the Flood; and Memorial Basin – two vs. two team play in one of the bloodiest battles in Halo history.

Included maps
Four maps are included in the Historic Battle pack.
 * Barrens (1v1 map)
 * Blood River (1v1 map)
 * Glacial Ravine (3v3 map)
 * Memorial Basin (2v2 map)

Achievements
The pack also includes four new achievements. All four achievements are included by default as part of Halo Wars: Definitive Edition.
 * Tour Coming Through: Hot drop 50 squads to your Covenant Leader in a single game on Barrens.
 * Never Leave a Man Behind: Finish a game with 5000 net resources contributed to your teammates on Memorial Basin.
 * Drain Cleaner: Kill 20 enemy squads with a continuous Covenant Leader Power on Memorial Basin.
 * Killjoy: Disrupt 5 active Leader Powers in a single game on Blood River.

Production notes
The Historic Battle pack was originally envisioned as only shipping with three maps; Barrnes, Blood River and Memorial Basin. However, Robot Entertainment saw a large fan demand for more 3v3 maps, and instead investigated the possibility of creating a new 3v3 map. Ultimately, it was determined infeasible to create a new map from scratch, so as a compromise the existing map Frozen Valley was used as a basis from which to create a new 3v3 map; Glacial Ravine.