>>714112798 (OP)no you don't understand
Lanius can't reinforce his supply lines because the Legion doesn't have the logistical capability to improve upon their existing supply lines in any way
they're a pre-industrial society, the literal best they can do is brahmin wagons and they're already doing it
Meanwhile the NCR is building a railroad into Vegas
Also as
>>714113330 mentioned there's the denver issue
A single city nearly destroyed the legion outright and they only barely held on because they conquered it and looted it before they starved
The NCR however has multiple cities, and they means to scorched earth them
if the Legion starts moving towards one city (and the NCR will know this in advance, Legion being footsoldiers couldn't get more than 30 miles in a day, even the romans couldn't manage to get more than 21 miles a day, while the NCR has cars and vertibirds to track their movement) the NCR can just evacuate it through rail and destroy all supplies, and then the Legion is fucked, they can't divert to another city because they're too far away and they can't loot the city, so the Legion runs out of food because NCR heartland is too far away to reliably supply through brahmin wagon