"We claimed this moon decades ago when we reforged ourselves after Exar Kun's defeat. Some of us call it home."
―A Mandalorian Neo-Crusader, circa 3,951 BBY
After assuming the leadership of the Mandalorians, Mandalore the Ultimate made Dxun his stronghold, from which he planned his attack on the Galactic Republic.
In 3,963 BBY, the Mandalorian Wars expanded into a galaxy-wide conflict when the Mandalorian Neo-Crusaders began their invasion of the Republic. From their headquarters on Dxun, Mandalore's forces attacked and took nearby Onderon in mere hours. A battle with the Republic forces took place on the moon, but it was little more that a rear-guard holding action by the Republic.
Years later, after the Jedi Revan and Malak had entered the war and pushed the Mandalorian forces back to their original Dxun staging-grounds, a far more bloody battle was fought. The Republic attempted to capture the Mandalorian headquarters on Dxun. Republic forces managed to defeat the Mandalorians, but the victory came at a heavy cost. The Mandalorian outposts were entrenched and well defended by hidden mines, traps, anti-air turrets, and the ferocious inhabitants of the jungle itself. During the bloody battle, the Republic lost ten soldiers for every Mandalorian killed. The Jedi Exile, who was in command of the battle, was forced to sacrifice dozens of her soldiers, sending them on a suicidal charge to disable the minefield that was the last obstacle keeping them away from the Mandalorian fortress.
After the battle, the Republic military did not bother to demolish many structures that the Mandalorians had built; nor did they uncover the many hidden weapons caches providently left in case the Mandalorians were someday to return.
In 3,956 BBY, Canderous Ordo took the title of Mandalore and gathered a handful of Mandalorians, most of whom were mercenaries at the time, on the Dxun moon, in the rebuilt headquarters of the old Mandalore. There they regrouped, concealing their presence from both the Republic and the native Onderonians, silencing all scouts who came anywhere near their encampment. Canderous hoped that, one day, the Mandalorians of Dxun would regain their former glory.