Iranian Fast Boats Fired on a U.S. Warship in the Strait of Hormuz — The Navy Had 90 Seconds to…

At 6:22 in the morning, the calm of the Strait of Hormuz was shattered by the sound of gunfire as an Iranian fast boat opened fire on the USS Gettysburg, a U.S. Navy guided missile cruiser.

The burst of heavy machine-gun fire from the bow of the Iranian Revolutionary Guard Corps (IRGC) vessel sent 12.7 mm rounds splashing into the water less than 400 meters from the Gettysburg’s hull.

This was not a warning sH๏τ; it was a direct attack.

A total of 12 Iranian boats had materialized in the gray light before sunrise, and the crew of the Gettysburg had been tracking them for nine minutes before the first sH๏τ was fired.

The Strait of Hormuz, at its narrowest navigable point, is only 21 nautical miles wide.

While that may sound like ample space for maneuvering, the reality is quite different.

Large warships and tankers follow designated traffic separation lanes—two nautical miles wide for inbound and outbound traffic, with a two-mile buffer zone in between.

Within these lanes, a naval vessel operating at transit speeds of 15 to 18 knots has very limited ability to accelerate, turn, or create distance from surface threats.

Iranian naval planners have spent decades studying this geometry, understanding where the lanes are, where sonar coverage is weak, and how to exploit the environment to their advantage.

The USS Gettysburg, displacing 9,800 tons and measuring 567 feet in length, was conducting a routine transit in the Strait when the incident occurred.

Armed with the Aegis combat system, two 5-inch deck guns, and a Close-In Weapon System (CIWS), the Gettysburg is a formidable surface combatant—but in a narrow lane surrounded by civilian traffic, it is constrained in its actions.

For several hours, the morning watch had been monitoring routine small boat traffic, logging contacts continuously.

At 6:13 a.m., a cluster of contacts appeared near the Iranian coastline at the northern edge of the traffic separation zone.

The radar profiles of the contacts matched those of IRGC fast boats, which are capable of high speeds and low radar returns.

By 6:14 a.m., the officer of the deck had alerted the captain, ᴀssessing the contacts as probable harᴀssment approaches consistent with previous patterns.

However, this ᴀssessment was incomplete.

The formation of boats was executing a channel compression maneuver, positioning themselves to occupy both the traffic separation lanes and the buffer zone simultaneously, forcing any responding U.S. warship to either slow down dramatically or risk colliding with civilian shipping.

At 6:17 a.m., the captain arrived on the bridge, and at 6:18 a.m., the ship went to a modified alert posture—not full general quarters, but a state designed to prepare for possible engagement without signaling maximum readiness to the Iranian boats.

This delay in escalating to full battle stations was scrutinized in the post-incident review, as the commanding officer aimed to avoid misinterpretation of American posture in a crowded international waterway.

At 6:21 a.m., the lead Iranian boat cut across the Gettysburg’s bow at approximately 600 meters, then 500 meters, as the formation began to close from multiple vectors.

The Gettysburg’s captain issued a warning on the International Maritime Distress Frequency, repeating the message three times in 40 seconds, but there was no response from the Iranian boats.

At 6:22:07 a.m., the machine gun opened fire, with rounds impacting the Gettysburg’s hull above the waterline on the port side, just forward of the bridge.

While there were no injuries or penetrations, the act of firing upon a U.S. Navy warship consтιтuted an escalation beyond mere harᴀssment.

General quarters sounded at 6:22:09 a.m., and the next 90 seconds would prove critical.

Under existing rules of engagement for this threat profile, the commanding officer had specific authorization to use force in self-defense.

However, the situation was complicated by the presence of civilian vessels in the vicinity and the varied armament of the fast boats.

Some boats were equipped only with machine guns, while at least two appeared to have rocket-propelled grenade systems or unguided rocket launchers on deck.

Firing the 5-inch main gun was not a viable option due to the weapon’s minimum safe engagement range and blast radius, which could endanger nearby civilian shipping.

The response came from the crew-served weapons, with the Gettysburg’s .50 caliber M2 machine guns manned within 30 seconds of general quarters.

Return fire was directed at the attacking boat, now approximately 380 meters to the port.

The first American burst was a warning sH๏τ fired across the bow of the Iranian boat, but it did not withdraw.

This moment became the focal point of numerous post-incident analyses.

The captain had to determine whether the swarm’s tactics indicated an intent to board, damage the ship, provoke a large-scale American response for propaganda, or escalate to the point of sinking or disabling the Gettysburg.

Each possibility required a different response, and none could be confirmed with certainty at that moment in the Strait of Hormuz.

The captain chose a graduated response, directing direct fire at the attacking boat while simultaneously activating the CIWS in manual control mode, signaling a visible deterrent.

An emergency call was made to CENTCOM Naval Command, requesting immediate air support.

The direct fire struck the attacking Iranian boat at 6:23:41 a.m., causing it to lose power and begin taking on water.

The crew of three to four personnel abandoned ship and went into the water, but the formation did not immediately withdraw.

At 6:24 a.m., two flanking boats accelerated toward the Gettysburg’s starboard side.

A second machine gun engagement from the starboard crew-served weapons forced one boat to break off, while the second boat closed to approximately 280 meters.

In response, the CIWS fired a warning burst of 20 mm rounds into the water directly ahead of the approaching boat, causing it to turn hard and retreat.

The remaining boats circled at a distance of 400 to 600 meters, engines running, as the situation stabilized for a moment.

At 6:27 a.m., two FA-18 Super Hornets from a carrier air wing conducting operations in the Gulf of Oman arrived on the scene, flying supersonic and rattling windows on every boat in the swarm.

The Iranian boats withdrew toward their coastline at 6:28 a.m., leaving the disabled boat behind.

Search and rescue operations by Iranian Coast Guard vessels reached the site approximately 35 minutes later, but American forces monitored without interference.

Post-incident ᴀssessments revealed that the 12 boats had staged from a position near Keshum Island, where intelligence analysts had previously ᴀssessed low activity.

The boats ᴀssembled offshore at night and transited to their initial position under emissions control, avoiding detection by American signals intelligence.

The combination of Keshum Island’s radar shadow and the duty watch’s focus on a different Iranian vessel further complicated the situation, allowing the boats to approach undetected.

This was not an opportunistic harᴀssment; it was a planned, coordinated operation with a built-in deception element.

The machine gun fire represented a significant escalation in IRGCN tactics, as fast boat swarms are typically employed for harᴀssment, signaling, and intelligence collection.

Firing on a U.S. Navy vessel is a serious departure from that doctrine.

Two possible explanations circulated in classified reviews: either the machine gun fire was unauthorized, or it was a deliberate test of U.S. rules of engagement in a crowded environment.

The second explanation was deemed more likely—Iranian planners were testing whether they could exploit American response constraints.

The crew of the USS Gettysburg effectively stopped the swarm, destroying one Iranian boat without any American casualties.

The arrival of air support prompted the remaining boats to withdraw.

In the 30 days following the incident, the U.S. Navy made visible changes, including additional gun mounts on destroyers and cruisers, increased helicopter availability during transits, and enhanced surveillance of Iranian coastal staging areas.

While operational adjustments were made, the broader strategic dynamic remained unchanged.

The Strait of Hormuz continues to be one of the most congested and contested maritime choke points in the world, with 21 million barrels of oil pᴀssing through daily.

American warships transit the Strait to communicate their commitment to freedom of navigation and to ᴀssert limits on Iranian coercive power in the region.

Iranian fast boat doctrine persists due to its strategic utility—these boats are inexpensive and can be replaced easily, providing valuable intelligence on American response timelines and tactics.

The crew member who fired on the Gettysburg was engaging in asymmetric warfare, testing the edges of American power with minimal exposure.

The post-incident report concluded that the engagement demonstrated effective application of graduated response in a complex maritime environment.

It also highlighted that adversaries are studying American decision-making processes just as carefully as the U.S. studies their tactics.

As the remaining Iranian boats undergo maintenance, American warships continue to patrol the Strait of Hormuz, standing vigilant in a region fraught with tension.