Any war that is fought on their home turf will be tough. I would be a long ardous war simular to WW2, or more likely comparable to Iwo Jima for lives be foot gained. Beyond the fact that this little nation having had 50 years of preparation time and foriegn aid (much of it from the US..., great use of American resources), it can also be assumed that they will have the backing of China, and possibly Russia again. While they're technology is inferior, it is still substancially effective.