Related. What the USA may do in the next war with NK.

In a secret underground base, Command Post Tango, the combined headquarters of the U.S.-South Korean command, is abuzz with activity. North Korean artillery has pummeled sites around Seoul, leaving thousands of South Korean and American civilians and service members dead. A toxic combination of North Korean provocations and U.S. escalation has prompted the North to launch a last-ditch effort to seize the whole peninsula.

Put fears of full-blown nuclear war aside for a moment. We’ve never been closer to a conventional North Korean attack on South Korea, and I can attest that the U.S. military knows how devastating the consequences would be. We can expect a massive humanitarian crisis, enormous loss of life, and economic disaster. There’s almost no doubt that the North would lose – but in going down Pyongyang could take much of the Korean Peninsula with it.

We've never been closer to a North Korean attack on South Korea: Here's what could happen
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock