One of the last known Mandalorian, the legend says the Shysa was sent with 211 of his companions to join the Clone War on Palpatine’s order. Still according to the legend, he would be one of the only survivors of the war along with Tobbi Dala and Boba Fett. When Tobbi and Fenn finally go back to Mandalore, it is only to find a ravaged planet, attacked by people who were exploiting the population. Thanks to the princess Leia Organa, they fought and conquered the enemy shortly after the battle of Hoth. When Tobbi fell in the enemy hands, Fenn captured a bounty hunter called Dengar. But the latter managed to escape the Mandalorians and went to inform the Imperials. The Imperials who quickly came and investigated Fenn’s base, the capital of Kelarbe.
Meanwhile, Fenn and Leia managed to get into the headquarters of those who had attacked Mandalore (the place). They saved Tobbi but could not help Tobbi from getting hit by the Suprema (the chief of the attackers). Finally Tobbi sacrificed himself to help them escape, while Fenn took over the Suprema. After leaving Mandalore for ever, Fenn stayed in touch with the Rebel Alliance, and helped a little in their struggle against the Empire