Apparently the Legion are thousands strong out east. Although this brings up another problem. Why does Caesar need New Vegas when he could probably, through slave labor, create an even bigger better Rome somewhere out east? He obviously could care less about a new civilization, he just wants to annihilate the NCR. Caesar is a political radical slash war criminal.
Caesar was dilusional when he said it was new Rome right?
I figured his main reason for hitting it so hard is his pride.
That was the first major loss for the Legion.
The only happy ending for the Legion in my book is if...
1. Caesar dies
2. Lanius dies...
3. Some one who was raised within the Legion not annexed into it takes over the reigns.
That could reform the Legion into what Caesar says he wants. However Caesar has far to much pride, and goes against his own ideas. I mean really an Auto-Doc? One of his guards should see him as weak, and take over command.
Also on a side note the NCR is gray... just not as deep a shade of gray as the Legion.