I would suggest that NK would not use its relatively limited number of "weak" bombs on the battlefield. Without getting too technical, in theatre terms a nuclear warhead is a point weapon, even if the point may be in the nature of several square kilometres. Having grown up in an army that trained and planned to fight a tactical nuclear war in Europe, and having been trainined in nuclear weapons employment analysis, let me add that a major principle is to avoid concentrating so as to make an attractive nuclear target. At the same time, your aim is to force the enemy to concentrate. Nuclear warheads small enough to be fired from tube artillery are limited in their yield - nuke speak for destructive power usually measure in thousands of tons of TNT or KT. Thus a 155mm nuclear round might have a yield of no more than .5 or at the most 1 KT. For comparisons sake, the device used at Hiroshima is supposed to have had a yield of 20 KT, although I have seen different figures. For a small warhead one needs accurate intelligence re the target and its location. The prospect of literally tens if not hundreds of tactical nuclear weapons being fired back and forth is conceivable in a Strangelovian sort of way, but is almost guaranteed to lead to escalation. In my opinion it is not really a feasible option for sane opponents. The question is the NK leadership sane by our standards?
This is moot, because NK as far as I know only has a limited arsenal. (I also believe the US has disposed of its tactical nucelar arsenal, or that is what has been reported.) In my opinion, given the weapons and delivery means it possesses, NK would be more likely to target major population centres, and would probably make sure this was known by its potential enemies. If it has several Hiroshima-yield type warheads, even with crude delivery systems it potentially still could devastate South Korea's population and economy. It is not too much to estimate fatal casualties in six or even seven figures and a world wide economic stagger, if not a collapse.
This is moot, because NK as far as I know only has a limited arsenal. (I also believe the US has disposed of its tactical nucelar arsenal, or that is what has been reported.) In my opinion, given the weapons and delivery means it possesses, NK would be more likely to target major population centres, and would probably make sure this was known by its potential enemies. If it has several Hiroshima-yield type warheads, even with crude delivery systems it potentially still could devastate South Korea's population and economy. It is not too much to estimate fatal casualties in six or even seven figures and a world wide economic stagger, if not a collapse.