to gain a victory―win the day―(一局部の勝ちなら)―gain the advantage
to prevail over the enemy―get the better of one's rival―get the upper hand of one's man―(議論なら)―have the best of it
to predominate―preponderate―over the others
(勝敗決せぬうちなら)to strive for victory―contest the victory―dispute the victory―(勝敗決してからなら)―claim the victory
You won.