There's a secondary campaign called "Aftermath" unlocked by attaining 40 stars in the main game. Aftermath takes place during Gears of War 3 showing Baird and Cole's perspective when they split up from Marcus and Dom to go find a ship and reinforcements.
The first Gears of War game not primarily developed by EPIC Games who are the creators of the franchise. Gears of War: Judgment was instead developed by People Can Fly studios while EPIC oversaw the project.
The last Gears of War game to be released by Epic Games before Microsoft acquired the franchise on January 27, 2014.
The first Gears of War game to have a prequel that takes place before the entire series.