(photo: credits)
That’s right it’s called “Historic Battles” and it will be available for download on July 21st for 800 points on the Xbox 360 and it has four new maps and as well as four new achievements. Well according to the Halowars website here are description of the maps and the achievements…
“Historic Battles” expands the universe for “Halo Wars” fans with four new multiplayer maps with varied terrains for players to find their competitive edge by using unique features of each map. The four new maps include:
- Barrens (1v1 Map): Difficult terrain channels units into killing zones. The side that controls the Forerunner artifacts will have the advantage.
- Blood River (1v1 Map): Secure base locations on nearby cliffs overlook this naturally red-tinged river. The soldiers that fought over its two narrow crossings gave the river its name, which has since taken on a greater meaning.
- Glacial Ravine (3v3 Map): A snow-topped mountain range forms a natural barrier that cuts this region in half. Control of the two energy walls at the narrow central pass often determines the outcome of the battle, though clever use of the Sentinel Factories may play a role as well.
- Memorial Basin (2v2 Map): The high ground in the middle offers good cover for infantry, while the generally open terrain transforms organized battle plans into bloodbaths.
“Historic Battles” also adds four new Achievements worth a total of 100 points:
- Tour Coming Through: Hot drop 50 squads to your Covenant Leader in a single game on Memorial Basin (30 points)
- Never Leave a Man Behind: Finish a game with 5000 net resources contributed to your teammates on Memorial Basin (15 points)
- Drain Cleaner: Kill 20 enemy squads with a continuous Covenant Leader Power on Memorial Basin (30 points)
- Killjoy: Disrupt 5 active Leader Powers in a single game on Blood River (25 points)
If you don’t own Halo Wars you can pick up a used copy
is scheduled to come out on October 6, 2009 according to IGN so 
