The U.S. Navy’s Savage 8-Hour War Against Iran


In April 1988, the United States Navy fought the largest surface naval engagement since the Second World War in a confrontation with the Islamic Republic of Iran that lasted less than 8 hours. The clash, known as Operation Praying Mantis, was the culmination of years of escalating tension in the Persian Gulf during the Iran–Iraq War.

To understand the events of that day, it is necessary to begin with the broader conflict. When Iraq invaded Iran in 1980, the war soon settled into a brutal stalemate characterized by trench warfare and heavy casualties. Alongside ground combat, both nations targeted each other’s cities with missiles in what became known as the “War of the Cities.” Yet another dimension of the conflict emerged in 1982, when Iraq sought to strike at Iran’s economic lifeline by attacking oil tankers carrying Iranian petroleum through the Persian Gulf. This marked the beginning of the so-called “Tanker War.”

The strategy had multiple aims. By disrupting oil exports, Iraq hoped to cripple Iran economically. There was also speculation that Saddam Hussein sought to draw Western powers into the conflict by threatening global oil supplies. Whatever the intention, the result was years of attacks on shipping in the Gulf. Iran retaliated in kind, and by the mid-1980s both sides were targeting not only each other’s vessels but also neutral shipping when it suited them.

By 1987, Kuwait—whose tankers were increasingly endangered—sought protection. Kuwaiti officials approached Washington with a proposal: if some of their tankers were reflagged under the American flag, would the U.S. Navy escort them? At the same time, Kuwait made a similar overture to Moscow. When the Soviet Union expressed willingness to provide protection, Washington reconsidered its initial reluctance. The United States agreed to reflag Kuwaiti tankers and protect them.

This initiative became Operation Earnest Will, a convoy mission that began in mid-1987. It significantly expanded the U.S. naval presence in the region, multiplying the number of American warships operating in the Persian Gulf. Reflagged tankers were given American names and home ports painted on their sterns, transforming them into U.S.-flagged vessels in both law and appearance.

The risks were immediate and real. Iranian forces deployed naval mines—some based on designs dating to 1908—consisting of a heavy anchor, a chain, and a spherical explosive charge fitted with contact horns. Properly laid, such mines would remain just below the surface, nearly invisible.

On April 14, 1988, the frigate USS Samuel B. Roberts, an Oliver Hazard Perry-class vessel, was escorting a tanker as part of Earnest Will. Commanded by Commander Paul X. Rinn, the Roberts was known for its rigorous training and disciplined crew. Rinn had instilled a strong sense of heritage in his sailors, reminding them that their ship bore the name of Coxswain Samuel B. Roberts, a Navy Cross recipient killed during the Guadalcanal campaign, and also echoed the legacy of USS Samuel B. Roberts (DE-413), a destroyer escort that had fought heroically at the Battle off Samar in 1944.

After completing an escort mission to Kuwait, the Roberts was transiting eastward toward the Strait of Hormuz when a lookout spotted objects in the water. Three floating mines were identified ahead of the ship. Rinn immediately ordered engines reversed, attempting to back out along the vessel’s wake. A frigate, however, is not designed for precise sternward maneuvering, and despite efforts to withdraw, disaster struck.

A mine detonated beneath the ship, tearing a hole the size of a truck into the hull and breaking the keel. The engine room flooded almost instantly. Power failed. Fires broke out. The ship, crippled in a minefield, faced the possibility of sinking.

Through disciplined damage control efforts, the crew fought flooding and fire for hours. Rinn addressed his sailors over the 1MC, urging them to remain steady, conserve energy, and continue the fight. The crew ultimately stabilized the ship, which was later towed to Dubai for repairs. The mine that nearly destroyed the Roberts had cost a fraction of the ship’s value, underscoring the enduring threat posed by relatively simple weapons.

An explosive ordnance disposal team recovered additional mines from the area. Serial numbers traced them to Iranian stocks. The United States had previously warned Tehran that further mining would provoke military action. The attack on the Roberts provided the final impetus.

At the time, U.S. naval forces in the region were commanded by Rear Admiral Anthony A. Less, serving as Commander, Middle East Force—an organization that predated the later reestablishment of the U.S. Fifth Fleet. The National Command Authority directed him to prepare a proportional response.

Several options were considered. A limited strike on Iranian oil platforms used by the Islamic Revolutionary Guard Corps (IRGC) for surveillance and command functions had precedent in an earlier operation, Nimble Archer. A direct attack on Iranian naval bases was rejected as escalatory. Ultimately, the plan approved called for destroying selected oil platforms and, if possible, engaging a single Iranian warship in international waters.

The operation would be executed by 3 surface action groups (SAGs)—designated Bravo, Charlie, and Delta—and supported by the aircraft carrier USS Enterprise, positioned in the northern Arabian Sea.

Operation Praying Mantis commenced on April 18, 1988.

Surface Action Group Bravo consisted of the destroyers USS Merrill and USS Lynde McCormick, along with the amphibious transport dock USS Trenton. Their primary objective was the Sassan oil platform, used by Iranian paramilitary forces. SAG Charlie, composed of the cruiser USS Wainwright and the frigates USS Simpson and USS Bagley, was tasked with neutralizing the Sirri platform. SAG Delta operated further afield, prepared to respond to emerging naval threats.

At approximately 08:00 local time, Bravo approached Sassan. The commanding officer issued a warning in Farsi over radio, granting personnel 5 minutes to evacuate before fire would commence. Small tugs departed the platform. After an additional delay to allow further evacuation, U.S. ships opened fire with 5-inch guns set to airburst.

When Iranian personnel returned fire with a ZSU-23-4 anti-aircraft gun, the engagement escalated. The destroyers targeted the gun emplacements directly. AH-1 Cobra helicopters launched from Trenton, firing TOW missiles at structures believed to house barracks and command facilities. After sustained bombardment, Marine boarding teams inserted via helicopter, placed demolition charges, and later destroyed the platform.

Simultaneously, SAG Charlie approached Sirri. After issuing warnings and observing evacuations, the group engaged the platform with 5-inch gunfire. Secondary explosions suggested munitions were stored on site, and the damage was deemed sufficient to forgo a planned Navy SEAL insertion.

While these actions unfolded, an Iranian missile boat, Joshan, approached SAG Charlie. Armed with Harpoon anti-ship missiles originally supplied to Iran before the 1979 revolution, Joshan presented a credible threat. U.S. commanders had been authorized to sink exactly one Iranian warship and initially hoped to engage a more capable target—one of Iran’s British-built Saam-class frigates.

Joshan, however, escalated the encounter. After radio exchanges in which the Iranian commander cryptically declared his intent to “carry out my mission,” the vessel locked fire-control radar on USS Wainwright and launched a Harpoon missile. U.S. ships responded immediately. Wainwright and Simpson fired 5 Standard missiles, 4 of which struck Joshan. The incoming Harpoon was decoyed by chaff and missed. Subsequent gunfire finished the crippled vessel.

During this engagement, E-2 Hawkeye aircraft detected Iranian F-4 Phantom jets approaching from Bushehr. USS Wainwright launched 2 Standard missiles in warning or defensive engagement; at least 1 Iranian aircraft was damaged, and both withdrew.

Meanwhile, Iranian Revolutionary Guard speedboats—Boghammer craft—began attacking neutral shipping, including a Panamanian-flagged oil barge and other vessels. Because these were not U.S.-flagged ships, authorization to engage required approval at the highest levels. The request moved up the chain of command to President Ronald Reagan, who granted weapons release authority.

A-6 Intruders from USS Enterprise, including aircraft flown by Lieutenant Commander James Engler, were vectored to intercept. Employing CBU-20 Rockeye cluster munitions, the A-6s attacked the speedboats. One Boghammer was destroyed; another escaped at high speed.

As the day progressed, long-sought targets emerged. One of Iran’s Saam-class frigates, Sahand, sortied from Bandar Abbas. SAG Delta reported the contact and received authorization to engage.

A-6 Intruders descended to low altitude to attack. Iranian guns opened fire, and surface-to-air missiles were launched. After hostile intent and action were established under the rules of engagement, U.S. aircraft retaliated. A Harpoon missile struck Sahand, followed by laser-guided and unguided bombs. Fires erupted aboard the frigate. Additional Harpoons and 500-pound bombs were delivered by other aircraft. Sahand eventually sank.

Shortly thereafter, the second Saam-class frigate, Sabalan—nicknamed “Captain Nasty” for its commander’s reputed brutality—entered the fray. Lieutenant Commander Engler’s aircraft attacked again, dropping ordnance that reportedly penetrated the ship’s stack and detonated in the engine room. Sabalan was left burning and dead in the water.

As Sabalan smoldered and Sahand slipped beneath the surface, Chairman of the Joint Chiefs of Staff Admiral William Crowe ordered the operation concluded. The objectives had been achieved. Further escalation was deemed unnecessary.

Operation Praying Mantis lasted less than 8 hours. In that time, the U.S. Navy destroyed 2 Iranian oil platforms, sank 1 major surface combatant, severely damaged another, and eliminated several smaller vessels. The United States lost 1 AH-1 Cobra helicopter and its 2 crew members.

The engagement marked several milestones. It was the first U.S. naval missile exchange between surface combatants and one of the earliest demonstrations of integrated digital networking among ships and aircraft. It also illustrated the enduring potency of asymmetrical threats: a mine of antiquated design had nearly destroyed a modern warship.

Strategically, the consequences were profound. Within weeks, Iran agreed to a ceasefire in the protracted Iran–Iraq War, which had lasted nearly 8 years and inflicted enormous casualties. The tanker attacks diminished significantly. Although many factors influenced Tehran’s decision, the destruction of half its operational navy in a single day underscored the risks of further escalation.

Operation Praying Mantis represented a transitional moment. It was among the last instances in which the U.S. Navy conducted a major, self-contained maritime operation without extensive joint-service integration. In later conflicts, from Operation Desert Storm onward, joint command structures and interservice coordination would become the norm.

In the Gulf on April 18, 1988, however, American naval forces operated largely as a traditional battle group, executing a complex, proportional response to a defined provocation. The result was decisive.

The lesson endured on multiple levels: that advanced networks and coordinated strike groups could dominate a maritime battlespace; that relatively simple weapons could still inflict disproportionate harm; and that calibrated force, applied swiftly and cohesively, could achieve strategic effect in a matter of hours.