The purpose of this column is not to warn of an imminent assault on Iran, though personally I think it is coming, and soon. Rather, it is to warn of a possible consequence of such an attack. Let me state it here, again, as plainly as I can: an American attack on Iran could cost us the whole army we now have in Iraq.
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Here’s roughly how it might play out. In response to American air and missile strikes on military targets inside Iran, Iran moves to cut the supply lines coming up from the south through the Persian Gulf (can anyone in the Pentagon guess why it’s called that?) and Kuwait on which most U.S. Army units in Iraq depend (the Marines get most of their stuff through Jordan). It does so by hitting shipping in the Gulf, mining key choke points, and destroying the port facilities we depend on, mostly through sabotage. It also hits oil production and export facilities in the Gulf region, as a decoy: we focus most of our response on protecting the oil, not guarding our army’s supply lines.

Simultaneously, Iran activates the Shiite militias to cut the roads that lead from Kuwait to Baghdad. Both the Mahdi Army and the Badr Brigades — the latter now supposedly our allies — enter the war against us with their full strength. Ayatollah Sistani, an Iranian, calls on all Iraqi Shiites to fight the Americans wherever they find them. Instead of fighting the 20% of Iraqis population that is Sunni, we find ourselves battling the 60% that is Shiite. Worse, the Shiites logistics lie directly across those logistics lines coming up from Kuwait.

U.S. Army forces in Iraq begin to run out of supplies, especially POL [petroleum, oil, and lubricants], of which they consume a vast amount. Once they are largely immobilized by lack of fuel, and the region gets some bad weather that keeps our aircraft grounded or at least blind, Iran sends two to four regular army armor and mech divisions across the border. Their objective is to pocket American forces in and around Baghdad.

The U.S. military in Iraq is all spread out in penny packets fighting insurgents. We have no field army there anymore. We cannot reconcentrate because we’re out of gas and Shiite guerrillas control the roads. What units don’t get overrun by Iranian armor or Shiite militia end up in the Baghdad Kessel. General Petraeus calls President Bush and repeats the famous words of Marshal MacMahon at Sedan: “Nous sorrune dans une pot de chambre, and nous y serron emerdee.” Bush thinks he’s overheard Petraeus ordering dinner — as, for Bush, he has.

U.S. Marines in Iraq, who are mostly in Anbar province, are the only force we have left. Their lines of supply and retreat through Jordan are intact. The local Sunnis want to join them in fighting the hated Persians. What do they do at that point? Good question.
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As I have warned before, every American ground unit in Iraq needs its own plan to get itself out of the country using only its own resources and whatever it can scrounge locally. Retreat to the north, through Kurdistan into Turkey, will be the only alternative open to most U.S. Army units, other than ending up in an Iranian POW camp.

Even if the probability of the above scenario is low, we still need to take it with the utmost seriousness because the consequences would be so vast. If the United States lost the army it has in Iraq, we would never recover from the defeat. It would be another Adrianople, another Manzikert, another Rocroi. Given the many other ways we now resemble Imperial Spain, the last analogy may be the most telling.
http://www.d-n-i.net/dni/2008/03/25/...ndra/#more-152

I find this pretty implausible, and I know a lot of folks on here are not Lind fans, but does anyone think this could actually happen?