Where Caesar saw his power expanding westward, he couldn't feel the noose tightening around his neck. However, before I died I would have established a sort of, 'counter-culture,' within the ranks of Caesar's most loyal that would see the Legion's disgusting tactics eroded greatly over time.
This would be a very slow, calculated process that would take years upon years, and end in my inevitable death. For years I would serve Caesar as a loyal spy, we'd push west swiftly with overwhelming speed and force, but what he wouldn't know is that his newfound settlements would be loyal to me. I'd get to spread my power among the other factions of the Mojave through careful use of my insider knowledge and swaying the tides of power to my favor.
Ideally I've been put among the Frumentarii as a spy, playing both sides of the fence is where any true master of battle will be found. I've always had a mind and body for espionage, and in lieu of the finer nuances of battle I can go toe-to-toe with the best of them Caesar would notice how distinguished I am, and my feigned love for his Legion would see me offered more and more dangerous tasks to either kill me and eliminate the threat of myself to Caesar and his legate, or getting closer and closer so as to keep me fighting in the Legion. Quickly, assuming I do not die in the process, I would make my way up the ranks to either Decanus or into the titles of the Frumentarii.