This title is a compilation of Independence War and its expansion pack Independence War Defiance. In Independence War, there is a huge conflict going on between The Indies, colonists from Earth, and the Commonwealth. And you take the role of an officer in the Commonwealth fleet.
In Defiance you are playing the Indie Side of the conflict. The add-on consists of 18 missions and it mirrors the original campaign. You are Edison Hayes, a captain of the Indie fleet and the Dreadnaught-class corvette Spartacus. Defiance also adds two notable new features to the game; ability to save in-mission and limited customization of player ship's weapons.
Independence War Defiance was designed to be an add-on pack but made its way into this bundle instead.