The phrase "victorious battle" means that one side in a fight or war has won or succeeded in achieving their goal or defeating their opponent. Full definition
One sets the film in motion: tribal prince Ashitaka's (voiced by Billy Crudup) victorious battle against a demonic boar, which turns out to be a forest god somehow transformed. (themoviereport.com)
While many of Jesus» followers dreamed he would overthrow the Roman government through a victorious battle, he was crucified in weakness (2 Corinthians 13:4). (relevantmagazine.com)
It chronicles Johnson's rapid ascent and rule as majority leader in the Senate, his victorious battle to pass a momentous civil rights bill and his election as vice-president to John F Kennedy in 1960. (totalpolitics.com)