Not many would survive. Some 14,000 tubes of North Korean artillery are laid on their priority targets right now, many of which are undoubtedly American positions.
If you can imagine a million rounds of artillery landing in the space of about an hour, you can picture the amount of devastation.
I have witnessed a "Time on Target" exercise involving sixteen battalions of Artillery. I was impressed, and I don't impress easily.
I cannot even IMAGINE what a million artillery rounds fired in the space of few hours would do. But I do know that I wouldn't want to be under them.
What too many posters totally misunderstand is that, as stated in this article, the 37kplus US troops are not "backed up" by ROK forces. Our troops are, as RA stated, a trip wire that raises the stakes. The ROK forces (22 combat divisions, 2300 tanks, 2 Marine divisions with armor, 200 plus warships, @ 500 aircraft) are formidable and vastly exceed any forces we could deliver to the peninsula ourselves. They're well trained, well led and well equipped, including F-16s. The ROK trained reserve force is between 4.5 and 5 million. They are there on the ground fighting for their own turf.
The toll would be shockingly high, no doubt about that, but the price would be paid by the Koreans. By the time we could get much more than one Infantry Division and the Third MEF on the peninsula the damage would be done. If we're supporting 250k Troops in the ME where does anyone think that we would get more than those two forces?
For the record, my last trip north of Seoul was just before Thanksgiving.