U.S. Navy Arleigh Burke Destroyer Fires Naval Gun in First Combat Interdiction of Iranian Ship.

The U.S. Navy Arleigh Burke-class destroyer USS Spruance (DDG-111) used its Mark 45 Mod 4 5-inch naval gun to disable the Iranian-flagged container ship Touska in the Gulf of Oman, marking a rare real-world combat use of precision naval gunfire in a high-risk maritime interception. The operation highlights the U.S. Navy’s ability to apply controlled force in a critical chokepoint while maintaining escalation control and protecting freedom of navigation.

According to information published by the U.S. Department of War on April 24, 2026, the destroyer’s fire disabled the vessel without destroying it, allowing boarding teams to secure and inspect the ship. This demonstrates how modern naval forces combine precision weapons with interdiction tactics to counter illicit activity and sustain sea control in contested waters.

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U.S. Navy USS Spruance (DDG-111) conducts maritime interdiction operations in the Arabian Sea on April 15, 2026, with an inset highlighting the Mark 45 Mod 4 127 mm naval gun used to deliver precision disabling fire during the seizure of the Iranian-flagged container ship Touska. (Picture source: U.S. Department of War, with additional editing of Army Recognition Group)

The interdiction began at approximately 0400 EST on April 19, 2026, and escalated over six hours as the vessel refused compliance, prompting the use of warning shots followed by targeted engagement. The action highlights the operational readiness of U.S. naval forces to enforce blockades and maintain freedom of navigation, a critical factor in deterring state-backed maritime violations.

The Touska, a large 965-foot container ship operating under the Iranian flag, was detected attempting to breach a U.S.-enforced naval control zone spanning the Gulf of Oman and Arabian Sea. Such vessels are of particular concern due to their capacity to transport large volumes of military materiel, including missile components, unmanned aerial vehicle systems, or sanctioned equipment, often concealed within commercial cargo. The refusal to comply with multiple hails and escalation signals triggered a pre-planned rules-of-engagement sequence designed to compel compliance while minimizing risk to personnel and collateral damage.

USS Spruance, an Arleigh Burke-class guided-missile destroyer, represents the backbone of U.S. Navy surface combat capability, combining advanced sensors, missile systems, and naval gunfire. The ship is equipped with the Aegis Combat System integrating the AN/SPY-1D(V) radar for multi-target tracking and ballistic missile defense. Its primary strike armament includes the Mk 41 Vertical Launching System, capable of deploying a mix of Standard Missile interceptors such as SM-2, SM-3, and SM-6, Tomahawk land-attack cruise missiles, and RUM-139 anti-submarine rockets. Close-in defense is provided by the Phalanx Close-In Weapon System, while anti-surface warfare is supported by Harpoon anti-ship missiles and embarked MH-60R Seahawk helicopters.

Central to the interdiction was the Mark 45 Mod 4 5-inch naval gun, a lightweight, fully automatic naval artillery system mounted forward on the destroyer. This 127 mm gun system is capable of firing a variety of munitions, including high-explosive, illumination, and inert rounds, at ranges exceeding 20 kilometers. In the Touska engagement, inert projectiles were selected to deliver precise kinetic impact against the vessel’s propulsion systems without triggering fires or secondary explosions. The gun’s high rate of fire and digital fire control enable accurate targeting of critical ship compartments, making it a key tool for graduated escalation in maritime interdiction operations.

A b-roll package of the Arleigh Burke-class guided-missile destroyer USS Roosevelt (DDG 80) firing a Mark 45 5-inch gun and a close-in weapons system, April 17, 2021. (Video source U.S. Department of War)

After issuing repeated warnings and firing five warning shots, USS Spruance, an Arleigh Burke destroyer, transitioned to disabling fire. The destroyer fired nine inert rounds precisely into the engine room of the Touska, effectively neutralizing propulsion without causing catastrophic structural damage or loss of life. This capability underscores the precision strike potential of naval surface combatants when executing maritime interdiction missions under strict escalation control.

Following the successful disabling of the vessel, U.S. Marines from the 31st Marine Expeditionary Unit conducted a vertical insertion boarding operation. Transported by rotary-wing aircraft from the amphibious assault ship USS Tripoli (LHA-7), the Marines secured the vessel, demonstrating seamless integration between naval surface forces and expeditionary units. This type of rapid boarding operation is central to modern maritime security doctrine, enabling the U.S. military to quickly seize and inspect suspect vessels in denied or contested environments.

The use of amphibious assault ships such as USS Tripoli, designed to deploy Marine Air-Ground Task Forces, significantly enhances operational reach. Equipped with a flight deck capable of supporting multiple helicopters and short takeoff aircraft, the vessel serves as a mobile base for rapid-response interdiction, crisis response, and force projection. The integration of such assets into interdiction missions reflects a shift toward multi-domain maritime operations, where sea, air, and expeditionary forces operate in synchronized fashion.

This interdiction follows two additional vessel seizures conducted within the same week by CENTCOM and U.S. Indo-Pacific Command, indicating a broader operational pattern aimed at disrupting illicit maritime networks. The coordinated tempo of these operations suggests increased intelligence-driven targeting of vessels suspected of violating sanctions or supporting adversarial military supply chains. Such actions directly contribute to degrading the logistical backbone of hostile actors, particularly in regions where maritime routes serve as primary supply corridors.

From a strategic perspective, the engagement sends a clear signal regarding the U.S. willingness to enforce maritime control measures against non-compliant vessels, including those operating under state flags. The ability to apply scalable force, from communication warnings to precision disabling fire, demonstrates a calibrated approach to escalation that balances deterrence with legal and operational constraints. This is particularly relevant in the Gulf of Oman, a critical transit route connecting the Strait of Hormuz to global shipping lanes, where disruptions can have immediate economic and security implications.

Technically, the use of inert munitions for disabling fire highlights a refined capability within naval gunnery doctrine. Rather than employing explosive rounds, which risk secondary damage or fire, inert projectiles allow for targeted kinetic impact designed to incapacitate specific ship systems. This precision reduces the likelihood of unintended casualties while preserving the vessel for inspection and intelligence exploitation. Such methods are increasingly important in gray-zone conflicts, where attribution, proportionality, and escalation management are critical.

The boarding and seizure of the Touska also provide potential intelligence value. Cargo inspection, crew interrogation, and onboard documentation can reveal supply chain networks, routing patterns, and links to sanctioned entities. These insights can inform future interdiction efforts and broader strategic planning, particularly in counter-proliferation and maritime security operations.

The operation reinforces ongoing U.S. efforts to maintain maritime dominance and uphold international norms in contested regions. As detailed in related coverage on [U.S. Navy maritime interdiction doctrine] and [Arleigh Burke-class destroyer combat capabilities], such missions are increasingly central to countering hybrid threats that blend commercial activity with military objectives. The integration of expeditionary forces, precision naval firepower, and real-time intelligence underscores a maturing operational model designed for modern maritime conflict environments.

In the broader context of great power competition and regional instability, the interdiction of the Touska reflects a proactive posture aimed at constraining adversary maneuver in key maritime corridors. By demonstrating both capability and resolve, U.S. forces reinforce deterrence while preserving the operational flexibility required to respond rapidly to emerging threats across multiple theaters.

Written by Alain Servaes – Chief Editor, Army Recognition Group
Alain Servaes is a former infantry non-commissioned officer and the founder of Army Recognition. With over 20 years in defense journalism, he provides expert analysis on military equipment, NATO operations, and the global defense industry.