DLC

Raven Down

Raven down is a free map released on January 10th 2007.  It's a close quarters map with a downed helicopter in the middle.

Old Bones

Old Bones is a free map released on January 10th 2007. Players fight their way around an old mausoleum.

Hidden Fronts DLC Pack

The first official DLC pack for Gears Of War, titled Hidden Fronts was released on May 3, 2007. It contains four maps: Bullet Marsh, Garden, Process, Subway. Epic originally charged for the Hidden Fronts pack, but they made the maps free four months later.

Bullet Marsh
Garden
Process
Subway