Fortunately, only 200 artillery rounds fell and then it was over. North Korea has the capability of reducing Seoul to dust, via conventional artillery in about a five minute span, maybe an hour if they take their time. Seoul has a population of over 10 million - not a small town. The situation is dangerous. Combat on the Korean peninsula was very like the battle of the Kursk bulge or the German winter offensive in 1944 in the Ardenne.
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from the article: North Korea shells South, killing 2 soldiers and prompting trade of fire