Universal Century 0079: The Principality of Zeon has declared its independence from the Earth Federation, and subsequently launched a massive war of independence, a war which has raged in every continent on earth and in nearly every space colony and lunar settlement. The Zeon have the upper hand through their use of a revolutionary new type of weapon, their humanoid like mobile suits. When a Zeon recon team disobey mission orders and begin attacking Side 7 its citizens stumble across the Federations latest weapon: the Gundam. With the aid of Earth Federation soldiers stationed aboard the MS carrier White Base the newly formed crew of refugees set out to change the course of the One Year War — or die trying.

(Source: Gundam Wikia)