South Korean must act with restraint because IIRC Seoul in within the artillery range of N Korea's gound-based artillery. The Rand Corporation estimated that there are enough tube artillery or MRLs, just beyond the DMZ, to rain down at least 175,000 rounds on Seoul in the first day of conflict. So, the South Koreans must also consider this fact. Even if the US responses to a blatant attack by the North, it would take days to effectively devastated the North. Our troops, in the DMZ, are but a tripwire and a speed bump.