The Onderonian resistance, spearheaded by Vaklu, emerged as a clandestine opposition force against the invading Mandalorian Neo-Crusaders amidst the chaos of the Mandalorian Wars.
Following the Mandalorians' seizure of Onderon, a resistance movement began, aiming to break the Mandalorian stranglehold on Onderon. This resistance had minimal impact until the intervention of the Jedi, who ultimately vanquished the Mandalorians, freeing Onderon from their dominion. Vaklu, who was the commander-in-chief of the Onderonian military, took charge of the resistance. Vaklu's leadership, even with the resistance's limited scope, transformed him into a celebrated war figure, garnering widespread support among the Onderonian populace.
During the Jedi Civil War, the Jedi Exile journeyed to Onderon and encountered a civilian falsely accused of being a Republic spy by Vaklu officers, who claimed to be a member of the Onderonian resistance. However, the Jedi Exile proved his innocence.