It is possible, i did it twice.
I had given up what stategy did you use to kill caesar? it seemed like all the time more reinforcements kept coming...
It's been a while and i don't have saves from back then (still have to check). I think the best is if you can send me the save of that mission (2 files) and i'll play it again from then (if i start the campaign from scratch, it will take me at least a month to get there). If it's ok for you, i'll pm you my email.