6 December 2024

Navigating Troubled Waters: The Houthis’ Campaign in the Red Sea and the Gulf of Aden


Prior to the Hamas-led 7 October 2023 attacks against Israel, Ansarullah (‘Partisans of God’, known best as the Houthis), a predominantly Zaydi Shia armed group with roots in northern Yemen, had been viewed by most international observers as primarily a local threat, despite belonging to Iran’s ‘Axis of Resistance’. This changed in October 2023, when the Houthis launched a first wave of missiles and uninhabited aerial vehicles (UAVs) against targets in Israel, ostensibly in solidarity with the Palestinians in Gaza. Seeing that most of the attacks failed to cause significant damage, the Houthis in November 2023 moved to attack merchant ships affiliated with Israel and its Western allies in the Red Sea and the Indian Ocean, delivering a propaganda victory for the group and sending shock waves through the shipping industry. Subsequent attacks have targeted more than 300 ships, using a wide range of weapons systems. Though most attacks missed or did little damage, the Houthis have sunk two ships and four sailors have lost their lives.

This report analyses the evolution of Houthi strategy at sea over the twelve months since the start of the campaign, particularly with regard to targeting criteria, geographic scope and weapons systems used. It also considers the international military response, which includes several multinational naval missions, as well as the actions by Israel, the United Kingdom and the United States against ground targets in Yemen. It demonstrates that these strikes, while temporarily degrading the capabilities of the Houthis, have not succeeded in significantly reducing the overall number of attacks on ships. Meanwhile, the Houthi arsenal continues to develop and expand. Consisting primarily of Iranian-designed ballistic and cruise missiles, as well as UAVs and uninhabited surface vessels, the group continues to improve the range of its weapons systems and the accuracy of its targeting. Analysing how the Houthis, who have been subject to a United Nations Security Council arms embargo since 2015, manage to smuggle weapons and their components to Yemen, the report illustrates the crucial role played by maritime smuggling using traditional dhows, and in particular the importance of the Red Sea ports of Hudaydah and Salif, which have remained under the control of the Houthis. It also discusses gaps in the enforcement of the sanctions regime and the important role of Yemen’s neighbours in this regard.

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