As Houthi rebels closed in, Eshraq Abdel Gelil and her husband fled their home, walking through the mountains before catching a ride to a nearby city. Four months pregnant, she feared another miscarriage.

They are among more than 125,000 people who have fled as the Iran-backed rebels have advanced down the Red Sea coast to a key maritime chokepoint. The offensive, linked to the wider Iran war, has threatened Saudi oil exports, pushed up global fuel prices and rattled markets.