TL;DR
Iran has intensified its use of small, missile-armed boats, known as the ‘mosquito fleet,’ to disrupt shipping through the Strait of Hormuz. This unconventional tactic aims to create instability and deny access, despite Iran’s damaged conventional navy.
Iran is actively deploying a fleet of small, missile-armed vessels in the Strait of Hormuz, aiming to disrupt shipping and exert coercive pressure in the region, according to recent reports.
Iran has developed an asymmetrical naval strategy centered on a ‘mosquito fleet’ of dozens of small boats equipped with missiles, drones, and machine guns. These vessels are used by the Islamic Revolutionary Guards Corps (IRGC) to threaten maritime traffic, especially container ships and oil tankers passing through the Strait. Despite the destruction of much of Iran’s traditional naval fleet by US and Israeli attacks, the IRGC maintains a significant, agile force capable of swarming and attacking in numbers. Recent incidents include the seizure of two large container ships on April 22, 2026, following an operation involving these small vessels.
Analysts, including Michael Eisenstadt of the Washington Institute, compare Iran’s tactics to WWII-era swarm tactics, emphasizing the fleet’s ability to impose friction and attrition rather than seek decisive naval control. The IRGC’s naval component operates independently from Iran’s conventional navy, maintaining a clandestine infrastructure of coastal bases, underground tunnels, and support systems for these vessels, which include mines, drones, and civilian ships adapted for military use. Iran’s layered missile network, including cruise and anti-ship ballistic missiles, further complicates efforts to counter these threats.
Why It Matters
This development matters because Iran’s use of small, fast attack boats in the Strait of Hormuz significantly increases regional instability and complicates efforts by the US and allies to secure vital maritime routes. The Strait is a critical chokepoint for global oil supplies, and disruptions here can have widespread economic and security repercussions. Iran’s strategy of asymmetric warfare—focused on denial and attrition—aims to deter or delay military intervention without escalating into full-scale conflict, thereby maintaining coercive leverage in the region.
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Background
The use of small boats in Iran’s naval tactics dates back to the Iran-Iraq war, where they were used to disrupt oil tankers in the Persian Gulf. Since then, Iran has continued to develop this unconventional fleet, especially under the IRGC’s command, to offset its limited conventional naval capabilities. Recent US and Israeli military actions have destroyed much of Iran’s traditional fleet, prompting a shift towards these swarm tactics. The proximity of Iran’s bases to the Strait of Hormuz allows rapid deployment and sustained harassment of maritime traffic, making the threat multidimensional, involving drones, missiles, mines, and small boats.
“The effectiveness of Iran’s fleet of small boats comes from their numbers and their use in swarms, which makes them difficult to counter.”
— Michael Eisenstadt, Washington Institute
“Most of Iran’s conventional platforms sunk or put out of commission are from Iran’s regular armed forces, while the IRGC maintains its own asymmetrical naval component, much of which remains intact.”
— Can Kasapoglu, Hudson Institute
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What Remains Unclear
It remains unclear how effective Iran’s small boat fleet will be against advanced US naval defenses or if Iran intends to escalate these tactics further. Details about recent operational successes or losses are still emerging, and the full scope of Iran’s maritime infrastructure in the region remains undisclosed.
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What’s Next
Next steps include increased monitoring of Iran’s naval activities, potential US or allied countermeasures, and diplomatic efforts to de-escalate tensions in the Strait. Analysts expect Iran to continue testing its swarm tactics and possibly expand drone and missile operations in the region.
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Key Questions
Why is Iran using small boats instead of larger ships?
Iran’s small boats are cheaper, more numerous, and harder to target than larger ships. Their agility and swarm tactics allow Iran to threaten shipping without engaging in traditional naval battles.
What is the significance of the Strait of Hormuz?
The Strait of Hormuz is a vital chokepoint for global oil shipments, with about 20% of the world’s oil passing through it. Disruptions here can impact global energy markets and security.
Could this lead to open conflict?
While Iran’s tactics aim to create instability and deny access, it is not yet clear if they intend to escalate to full-scale conflict. Current efforts appear focused on coercion and deterrence.
How are the US and allies responding?
Details of specific military responses are not publicly confirmed, but increased patrols and surveillance in the region are expected. Diplomatic efforts are ongoing to de-escalate tensions.
