Operation Praying Mantis and the Day the Navy Answered Iran in 1988

Folks, let me tell you about the best-kept secret in the history of American naval power: it worked. A nation that had been laying mines in international waters got hit back, hard and exactly as hard as it deserved, in one afternoon. No decade of speeches, no "strategic patience," no committee with an acronym. Just a Navy with orders and a President who gave them. If that story sounds exotic, it is only because most of the coverage of Persian Gulf policy since has been about everything except what happened on April 18, 1988.

So let me walk you through it, because it is a good story, it is a true story, and it has a moral that is still useful. The moral is that proportionate force, used promptly and for a stated purpose, can end a fight that months of restraint had only prolonged.

The Gulf at war

Start with the setting. In September 1980, Iraq invaded Iran, and the two countries settled into one of the grinding wars of the century, which ground on for eight years. By 1984 it had spread to the water. Both sides began attacking each other's oil shipping, and then the ships of neutral countries that carried that oil. Newspapers called it the Tanker War. It mattered to America because the Gulf was then, as now, the pipe through which a large share of the world's oil flowed.

Kuwait, a small country that was helping to finance Iraq, found its tankers under attack. In 1987 it asked for protection. The Soviet Union, interestingly, agreed to charter it some tankers. The Reagan administration did not want Moscow becoming the guardian of Gulf shipping, so it agreed to put eleven Kuwaiti tankers under the American flag and escort them. The effort was called Operation Earnest Will, and it began in July 1987. Under international law, a ship under the American flag was American in every way that mattered, and attacking it meant attacking America.

The first big test came almost at once. On July 24, 1987, the reflagged tanker Bridgeton hit a mine. Nobody was killed, but the point had been made: mines were the weapon of choice for a poorer navy against a richer one. They are cheap, they are deniable, and they sit patiently for anyone to hit.

The Iranians then did things that made the question of who was behind it easy to answer. In September 1987, American helicopters caught an Iranian vessel, the Iran Ajr, laying mines at night, and U.S. forces seized it. In October 1987 an Iranian Silkworm missile hit a Kuwaiti tanker flying the American flag in Kuwaiti waters, and the Navy answered by destroying Iranian oil platforms that were being used as military outposts, in what was called Operation Nimble Archer. The Navy showed that it could hit back, and it did so in a measured way.

The mine

Now to the incident that gave us the name. On April 14, 1988, the guided-missile frigate USS Samuel B. Roberts was escorting ships in the central Gulf when it struck a mine. The explosion tore a hole in the hull, broke the ship's keel, flooded the engine room and set fires burning. Ten sailors were injured, and a ship that should by every reasonable measure have been lost stayed afloat.

I want you to hold that image for a moment, because it is the one the coverage tends to skip. A crew of American sailors, in the middle of a hostile sea, saved their own ship with damage control training, hard work and a refusal to quit. Nobody died, and that was not an accident. It was the result of training, discipline and leadership. The ship was later repaired and returned to service.

The next question was who laid the mine, and the Navy had its answer. Divers and explosive ordnance specialists found other mines in the area, of a type that matched Iranian mines, including serial numbers that connected them to the stocks of the Iranian navy. The mine that nearly sank the Roberts was not an act of God or a stray from an old war. It was a weapon deliberately placed in the path of a ship the Iranians knew was operating there.

The response: April 18

The President and his advisers had a decision to make. The Roberts had been struck on April 14, and the administration took four days to choose and prepare a response. That choice is worth thinking about. A reaction on the same day would have been an impulse. Four days allowed the Joint Chiefs, led by Admiral William Crowe, to plan something precise. The commander on the scene, Rear Admiral Anthony Less, led the forces involved.

On the morning of April 18, 1988, the Navy carried out Operation Praying Mantis. It had two main parts.

First, the oil platforms. U.S. forces attacked two Iranian offshore platforms that Iran used as military command-and-control centers and bases for attacks on shipping. The Sassan platform and the Sirri platform were targeted. Crews were warned beforehand, with a radio call giving them time to leave, and then the platforms were shelled and destroyed or put out of commission. Notice that detail: the Navy gave the people on the platforms a chance to get off. That is not the behavior of a country looking for casualties. It is the behavior of a country trying to send a message at the lowest possible human cost.

Second, the Iranian navy. Iran did not accept the message quietly. Its ships and boats came out to fight. An Iranian frigate, the Sahand, engaged American forces, and U.S. ships and aircraft sank it. Another frigate, the Sabalan, was hit by a laser-guided bomb dropped from an American aircraft and left crippled. A fast attack craft, the Joshan, tried to fire on U.S. ships and was sunk by the USS Wainwright. Smaller armed boats were hit. In total, the Navy sank or crippled several Iranian warships and boats.

The Navy lost one helicopter, and two Marine aviators aboard it died. It is a sorrow, and it belongs in the record. But the numbers tell the story: a short, intense action in which the larger and better-equipped force sank or crippled several of its opponent's warships while taking minimal losses of its own. It is usually described as the largest American surface naval action since World War II.

What followed

Here is the part that deserves more credit than it gets. After the last of those clashes, American forces adopted a posture meant to calm things down, and the fighting between the two navies stopped, though there were near-clashes that night and the next day. The regime had found out what a bad bet it had made.

That does not mean the story had no ugly turns. On July 3, 1988, the cruiser USS Vincennes, in a surface fight with Iranian boats in the Gulf, shot down Iran Air Flight 655, a civilian airliner, killing all 290 people aboard. It was a tragedy, caused by a decision made in the fog of a battle, with a warship that believed it was under attack and an aircraft that was misidentified. America expressed regret and later paid compensation. I mention it because an honest account of the Gulf in 1988 has to, and because the lesson of the Vincennes and the lesson of Praying Mantis go together: force is a serious instrument, and it carries serious risks even when used with discipline.

A few weeks later, on August 20, 1988, a cease-fire took effect in the Iran-Iraq War. Iran had accepted United Nations Security Council Resolution 598, which called for it. There are many reasons the war ended, including exhaustion, losses on the ground and the Iraqi use of missiles and chemical weapons. Nobody can say precisely how much weight to give the naval action in that decision. What the record does show is that the fighting between Iranian and American forces ended after the Navy hit back, and that Iran accepted the cease-fire a few months later.

The numbered argument

Let me draw the lesson in the form I like, with the premises in order.

1. A threat that is cheap to the attacker and costly to the victim has to be made expensive. A mine costs little. A damaged frigate costs a great deal. If the attacker pays nothing, the attacks continue. Praying Mantis made the attack expensive.
2. Proportion is a virtue, not a weakness. The Navy did not try to invade Iran, close the Iranian ports or topple the regime. It hit the platforms used to attack ships and the vessels that came out to fight. A response that is proportionate is one an enemy can understand and an ally can support.
3. Warning shots save lives. The notice to the crews on the platforms was a deliberate choice, and it shows that a powerful navy can be restrained without being timid.
4. Speed and clarity matter. Four days is a long time in politics and a short time in war. The response came quickly enough to be connected to the offense and was specific enough to be understood.
5. Credibility is the real asset. Everything depends on the other side believing that you will follow through. The Navy had been escorting tankers for months, the President had committed America's flag to the effort, and when the test came, the commitment was honored.

The objection

The strongest objection comes from the restraint side, and I will state it fairly. Escorting Kuwaiti tankers meant putting American ships in the middle of someone else's war, where a single mine or missile could produce a crisis. The Gulf was not America's fight, the objection goes, and the reflagging operation invited exactly the incidents it was meant to prevent. The Vincennes disaster is the exhibit: an operation that put American warships in a crowded and dangerous waterway ended with a civilian airliner shot down.

That is a serious argument, and I will not wave it away. Some version of it applied in 1987, and it applies to every deployment. But three things answer it. First, the principle at stake was freedom of navigation, which has been a core American interest since the early republic. Second, the alternative to an American escort was a Soviet one, or none, and a vacuum in the Gulf would not have stayed empty. Third, the record of the response itself: America did not escalate beyond what the provocation justified, and the Iranians chose to stop.

The constitutional anchor

Let me anchor this in the document, because the commander-in-chief question comes up every time force is used. Article II, Section 2 says the President "shall be Commander in Chief of the Army and Navy of the United States". That sentence gives the President authority over the conduct of operations, including a response to an attack on a ship flying the American flag. Congress holds the power to declare war and to fund the fleet, and the Founders were careful to separate the two. The balance is a long debate, taken up in Commander in Chief Means Less Than Presidents Claim and More Than Critics Say. Praying Mantis sits comfortably within the President's authority to defend American forces and shipping. A war to topple Tehran would not, without Congress. The distinction between the two is the whole point of the design.

There is also a link to a rule of thumb that the Pentagon of that era set out for using force: the tests described in The Weinberger Doctrine Set Six Tests Before Sending Troops to Fight. A clear objective and a plan to achieve it are what the Gulf response had, and the Lebanon deployment five years earlier arguably did not. For the tragedy that taught those lessons, see Beirut 1983 Was the First Lesson in How Iran Fights Through Proxies.

The bigger picture

There is a reason the Navy could do this in a single day, and it was not luck. It had ships, trained crews, aircraft and munitions on station, built by the long investment of the preceding years. The matter of how fleets are built and what goes wrong when they are not is covered in Zumwalt, the Littoral Combat Ship and the Lessons of Procurement Failure, and the broader case for a fleet in Six Arguments Against a Strong Navy, and Why Each One Sinks. The decision to maintain readiness is made years before the crisis.

And the Gulf matters for reasons beyond the headlines. The way the nation thinks about oil, supply and strategic stocks, a subject told in The Strategic Petroleum Reserve Was Built for War, Not for Gas Prices, depends on the security of those sea lanes. The Iranian regime that laid those mines is the same one whose nuclear activities are timelined in Iran's Nuclear Program From Natanz in 2002 to the JCPOA's End, a Timeline. The pattern of testing and retreating when met with strength is worth keeping in mind.

One more wry thought, because I cannot resist. Every time America uses force with restraint, a certain type of commentator announces that it is both a reckless escalation and a weak and pointless gesture, sometimes in the same paragraph. The Navy sank a frigate, left two platforms smoking and went home, and somewhere an editor was drafting a headline that managed to be alarmed and unimpressed at once. That is quite a trick. It is also a reminder that the people who judge military action by the mood of the day will always find a way to be disappointed.

The case in brief

1. After Iran mined the Gulf and a mine struck the USS Samuel B. Roberts on April 14, 1988, the Navy carried out Operation Praying Mantis on April 18.
2. The response hit the platforms used for attacks, warned the crews first, sank or crippled Iranian ships that engaged, and stopped there.
3. Proportionate, prompt force ended the clashes between Iranian and American forces in the Gulf, and the cease-fire in the Iran-Iraq War followed that August.
4. The risks were real, as the loss of Iran Air Flight 655 showed, and an honest account includes them.
5. The President's authority as Commander in Chief covers defending American forces and shipping, and Congress keeps the power to declare war.

What you can do: read Article I, Section 8 and Article II, Section 2 side by side, then ask your representative which of the two powers Congress is using, and which it has let lapse.