The sentences convey the same meaning, one being in the active voice, the other in the passive voice. Right, it is assumed he wants to win, so "eventually to defeat" would take care of that doubt. I think it works better in the sentence in the active voice (comma between 'defense' and 'eventually').
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navitasanIs the 'to clause' a result clause or a purpose clause?It smells a lot more like a result clause to me.