I get the first one, but the area with the general is big enough where they could just run around until the Legion rus out of grenades (I hardly ever see them using them anyways) I'm not saying the NCR would win, but they could probably make it a pyhricc(sp) victory.
Well yeah the one's by the general have a damn good position, I found Oliver harder to fight than Lanius really.
Still, there are ways to kill them off without heading directly towards them, the final room where you meet oliver is closed off, so lobbing in grenades could work to damage their forces or at least give a decent enough shock approach allowing the legionnaires to storm it after the grenades have exploded.
A different approach is to heavily trap the area and just starve them out, either they try to escape and get caught in a myriad of traps or they die from hunger, or Legion attacks them when they are too weak to fight back.
It's a great defensive position for a head on attack.
But if the enemy does not attack head on but does one of the other things then they're screwed.
Hardly think Lanius would care though, he'd send legionnaires in anyway until they run out of bullets and then storm the General himself.