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In the hills above the 148-mile-long DMZ the North Korean military has an estimated 10,000 artillery pieces. They are well dug in, some in fortified bunkers and caves. Not all of them could reach the centre of Seoul, but some could, and all are able to reach the greater Seoul region. There's little doubt that within two or three days the combined might of the South Korean and US air forces would have destroyed many of them, but by that time Seoul would be in flames.