I don't really agree - a dedicated populous with light arms in both cases was able to ward off a full victory on their home turf, and the US caved to losses and other pressures (60k dead americans in 'nam, hundreds of thousands wounded physically, notorious trauma uncounted etc).

I don't have any sort of civil war fantasy, but I think that holding out against a military deployment in-country until it became socially and politically untenable would be pretty reasonable.