The Gundam would turn the tide of war in favor of the Earth Federation during the One Year War against the Principality of Zeon. The unit was primarily piloted by the series’ main protagonist Amuro Ray.
Some history documents stated the starting point of One Year War should be from the the Dawn Rebellion of U.C. 0076, an uprising of the Cadet Officers from the Republic of Zeon Military Academy toward the Guardian Banchi Garrison. While factual collection indicated said rebellion is started by Garma Zabi to stop the Federation Garrison in their supression and massacre of Zeon civilians, there are rumors that indicated that Garma was manipulated by Char Aznable in his quest for revenge against the Zabi family.