The Houthis' lightning seizure of Yemen's Red Sea coastline this month was the easy part. Now comes the hard part: holding it. The group's push into the Kahboub Mountains — a rugged highland region spanning Lahj and Taiz governorates, roughly 40km from the Bab al-Mandeb strait — is a fight for the terrain that would make their coastal gains defensible rather than exposed. Experts interviewed by Al Jazeera are uniform on one point: Kahboub's value is primarily defensive, not offensive. The mountains would serve as a natural wall protecting the Houthis' rear along the coast, cutting the newly captured littoral off from government-held southern Yemen. Without the high ground, Houthi forces stationed along the Red Sea remain vulnerable to flanking attacks and supply-line interdiction from government positions to the south and east. Faozi Al-Goidi of the Middle East Council on Global Affairs framed it bluntly: controlling Kahboub would "cut the coast off from the government-held south and place direct pressure on Lahj and, in the longer term, Aden." The broader strategic prize is Taiz, Yemen's third-largest city and the bridge between the Houthi-held north and the government-held south. Kahboub alone doesn't sit across the Taiz-Aden supply route, but it pressures the southern and western approaches. The real danger for government forces emerges if the Houthis can push further east through Al-Wazi'iyah toward the Al-Turbah-Lahj axis — a move that would strain defenders across multiple mountain fronts simultaneously while narrowing their logistics corridors. Taiz has enormous symbolic weight: it resisted Houthi control after the 2014 Sanaa seizure and endured years of siege. A breakthrough there would carry political consequences far beyond territory. The shipping dimension is real but secondary to the immediate military calculus. The Houthis have stated their Bab al-Mandeb restrictions would target only Saudi-linked vessels, but their track record during the previous Red Sea campaign — striking ships with no demonstrable connection to stated targets — makes such assurances unreliable. Securing Kahboub and the adjacent coastline would give the group what Ewa Strzelecka of LSE called "strategic resilience" around one of the world's principal maritime chokepoints: the ability to sustain missile, drone, and unmanned-boat infrastructure with supply lines protected from behind. The international dimension is escalating. The New York Times reported that President Trump came close to ordering air strikes against the Houthis on Sunday before calling them off. Britain has committed to supporting Saudi Arabia with defensive refuelling. The Houthis' advance coincides with disruption to shipping through the Strait of Hormuz by their principal ally, Iran — meaning both of the Red Sea's gateways are now under pressure from aligned actors. The terrain itself is slowing the offensive. Unlike the rapid coastal advance, mountain warfare in Kahboub is grinding and attritional. Footage from the Taiz Military Axis Command shows intense fighting on mountain fronts between government-aligned forces, local fighters, and Houthi units. Mohammed al-Basha, a former spokesperson for Yemen's embassy in Washington, noted that "control of a single hilltop or mountain peak can come at a heavy cost." The Houthis have momentum, but converting flat-terrain speed into highland territorial control is a fundamentally different military problem. The structural question is whether the internationally recognised government — fragmented, dependent on Saudi backing, and now defending on multiple axes — can hold mountain positions that the Houthis are willing to pay heavily to take. If Kahboub falls, the Houthi position shifts from a vulnerable coastal strip to a defensible strategic perimeter around Bab al-Mandeb, with implications for Yemeni sovereignty, Red Sea commerce, and the regional balance of power for years to come.
