ARC-77, known as «Fordo,» was an Alpha-class Advanced Recon Commando captain in the Grand Army of the Republic. In 22 BBY, he was assigned to a task force led by the Jedi Knight General Obi-Wan Kenobi, to take the Confederate-held world of Muunilinst. Together with a group of clone troopers that would later come to be known as The Muunilinst 10, Fordo proved instrumental in the Battle of Muunilinst, leading his troops to destroy an enemy artillery emplacement, and then helping Kenobi capture the enemy leader, San Hill.
Immediately after the battle was over, Fordo was dispatched to the planet Hypori, where a group of Jedi Knights had been trapped by the Confederate General Grievous. Making their way to the Jedi’s location, Fordo and his men battled Grievous, but were unable to kill him. They were, however, able to recover three survivors: Ki-Adi-Mundi, Aayla Secura, and Shaak Ti. In 19 BBY, Fordo was on Coruscant when the planet was attacked by the Confederacy. Despite facing overwhelming numbers, Fordo and his men were able to beat back a portion of the attacking force with the help of the Jedi Masters Mace Windu and Yoda.