Houthis take Mayyun and Mocha as Bab al-Mandeb shipping risk rises

Houthi forces captured the Yemeni port of Mocha on Thursday, September 10 and Mayyun island in the Bab al-Mandeb on Friday, September 11, according to the Associated Press. The advance materially improves the group's position around the Red Sea's southern entrance: Mayyun sits inside the strait, while Mocha adds a mainland logistics point on the Yemeni coast.

The latest public traffic count does not yet measure the effect of that advance. Preliminary tracking data cited by Reuters show 28 commodity vessels crossed Bab al-Mandeb on September 9, almost exactly the 10-day average of 27. That observation came before Mocha and Mayyun fell. It establishes that the route was functioning at its recent pace immediately before the captures; it cannot establish that operators have continued to use it at the same rate afterward.

The chronology also resolves a misleading number circulating around the chokepoint story. The seven-vessel count on September 9 referred to the Strait of Hormuz, not Bab al-Mandeb. The two waterways are simultaneously exposed to conflict, but their vessel counts describe different routes and cannot be combined into one measure of shipping disruption.

The military map changed before the commercial denominator did

The seizure can still reprice the route before a post-capture transit decline appears. Mayyun gives the Houthis a position inside the strait that can support more persistent surveillance and attack threats; Mocha improves coastal access and logistics. Neither fact by itself establishes uncontested control of the waterway or a physical closure.

That distinction is commercially important because operators do not need to wait for a channel to become impassable before diverting. The Red Sea crisis since 2023 already showed that credible missile and drone risk can prompt carrier suspensions, higher war-risk premiums and Cape of Good Hope diversions. AP reports that Red Sea shipping remains roughly 60% below its pre-crisis level, so the latest territorial gain lands on a route whose commercial use was already depressed.

A diversion around the Cape consumes more vessel-days, fuel and working capital and can disrupt schedules even when cargo eventually arrives. Tanker, bulk and container economics differ, but the common first-order question is whether insurers, charterers, carriers and crews still accept Bab al-Mandeb passage at tolerable cost.

Hormuz makes that choice more consequential. The two straits serve different flows, but simultaneous risk at the Persian Gulf exit and the Red Sea entrance reduces routing flexibility and increases the value of alternative pipelines, inventories and spare shipping capacity. It also means a new deterioration at Bab al-Mandeb would arrive when energy logistics are already under stress elsewhere.

The current evidence therefore supports a higher probability of renewed Red Sea avoidance, not a claim that the latest Houthi advance has already removed strait capacity. No public post-Mayyun traffic count yet verifies a sustained fall in crossings. The economic shock becomes measurable if post-capture transits drop materially or if major carriers and war-risk insurers withdraw; until then, the new fact is a more threatening military position around a route that was still functioning immediately before it changed hands.

Sources

• Associated Press, September 11, 2026: https://apnews.com/article/025d052a14d9481258d51009a76d0bd6
• Reuters shipping-traffic report, September 10, 2026: https://www.internazionale.it/ultime-notizie-reuters/2026/09/10/hormuz-shipping-traffic-in-single-digits-data-shows